2. There are three grasslands with an area of 5 15 and 24 mu respectively. The grass on the grassland is as thick and grows as fast. The first grassland can feed 10 cows for 30 days, and the second grassland can feed 28 cows for 45 days. How many cows can eat on the third grass for 80 days?
3. A project, contracted by both parties, can be completed in 2.4 days and needs to be paid 1800 yuan; Contracted by Team B and Team C, it can be completed in 3+3/4 days, and it needs to be paid 1500 yuan; Contracted by two teams, Party A, Party B and Party C, it can be completed in 2+6/7 days at a cost of 1.600 yuan. On the premise of ensuring the completion within one week, which team will spend the least?
There is a rectangular iron block in the cylindrical container. Now turn on the tap and pour the water into the container. In 3 minutes, the water surface is just above the top of the cuboid. /kloc-After 0/8 minutes, the container has been filled with water. It is known that the height of a container is 50 cm and the height of a cuboid is 20 cm. Find the ratio of the bottom area of a cuboid to the bottom area of a container.
Two bosses, A and B, bought a fashion at the same price, and B bought 1/5 sets more than A, and then they sold them at profit margins of 80% and 50% respectively. After both of them were sold out, A still made more profits than B, just enough for him to buy 65,438+00 sets of this fashion, which A bought at the beginning.
6. There are two water pipes A and B, and water is injected into two pools with the same size at the same time. At the same time, the water injection ratio of A and B is 7: 5. After 2+ 1/3 hours, the sum of the water injected into A and B is just a pool. At this time, the water injection rate of pipe A is increased by 25%, while pipe B remains unchanged.
Xiao Ming walks from home to school in the morning. When he ran halfway, his father found that Xiao Ming's math book was left at home, and then he rode to deliver it to Xiao Ming. When he caught up, Xiao Ming still had 3/ 10 to go. Xiao Ming got on his father's car at once and was sent to school by his father, so Xiao Ming arrived at school five minutes earlier than walking alone. How long does it take Xiaoming to walk from home to school?
8. Car A and car B both start from place A and pass through place B to place C. The distance between the two places is equal to the distance from place B to place C. The speed of car B is 80% of that of car A. It is known that car B started earlier than car A 1 1 minute, but stayed in place B for 7 minutes, but car A drove all the way to place C. Finally, car B was later than car A..
9. Two cleaning vehicles, A and B, perform road cleaning tasks between things. It takes 10 hour for car A to be cleaned alone, and 15 hour for car B to be cleaned alone. Two cars leave from east and west at the same time. When they met, car A was cleaner than car B12km. How many kilometers is it between East and West?
/kloc-4 containers of 0/0.3 tons, 5 containers of 2.5 tons, 1 0.5 tons/4 containers, and 7 containers of1ton. So how many cars with a load of 4.5 tons are needed to transport all the containers at once?
Comprehensive Training of Mathematical Application Problems in Primary Schools (02)
1 1. Both the master and the apprentice * * * processed 170 parts, and the number of parts processed by the master was 1/3 more than that processed by the apprentice, so how many parts did the apprentice process?
12. Both a cart and a car drive from A to B, and the speed of the cart is 80% of that of the car. It is known that the big car started 17 minutes earlier than the small car, but it stopped at the midpoint of the two places for 5 minutes before continuing to B. However, after the small car started, it went straight to the second place without stopping. Finally, the bus came second before the bus. It is also known that the bus departs from the first place at 10 in the morning. So when did the bus catch up with the bus in the morning?
13. For a manuscript, it takes 14 hours for Party A to type alone, and 20 hours for Party B to type alone. If Party A types 1 hour first, then Party B types 1 hour instead of Party A, and then Party A types 1 hour instead of Party B. .................................................................
1There are 3 yellow balloons in 4.2 yuan and 2 flower balloons in 3 yuan. The school * * * bought 32 balloons, 4 of which were fewer than yellow balloons. What balloons do schools spend more money on?
15. The sailing speed is 60m/min. In a river with a current speed of 20 meters per minute, the ship travels from the upstream port to the downstream place, and then returns to its original place. * * * How many meters did the ship walk from the upstream port to the downstream in 3 hours and 30 minutes?
16. Granary A contains 43 tons of flour and Granary B contains 37 tons of flour. If the flour from granary B is loaded into granary A, the remaining flour after granary B is full accounts for 1/2 of granary B's capacity. If the flour from granary A is put into granary B, after granary B is full, the remaining flour from granary A accounts for 1/3 of granary A's capacity. How many tons of flour can each granary hold?
17. When A is divided by B and B is divided by C, the quotient is equal and the remainder is 2. The sum of A and B is 478. So what is the sum of a, b and c?
18. A car traveling from A to B will arrive 1 hour later than the original time if it slows down 10%. If you drive at the original speed 1 80km, you will arrive1hour earlier than the original time. What's the distance between a and b?
19. A school participated in the military training queue performance competition and organized a phalanx team. If there are 60 students in each class, there must be at least 4 classes in this phalanx. If there are 70 students in each class, there must be at least 3 classes in this phalanx. How many people should this phalanx consist of?
20.a, B and C lathes process square and round parts. It is known that two out of every three parts machined by lathe are round; Three out of every four parts machined by lathe B are round; Four fifths of the parts processed by lathe C are round. On this day, three lathes * * * processed 58 round parts, and the number ratio of square parts processed was 4: 3: 3. So how many parts were processed by the three lathes on this day?
Comprehensive Training of Mathematical Application Problems in Primary Schools (03)
2 1. The length of circular metal wire is 30m, and three metal wires with length a are intercepted and five metal wires with length b are intercepted. If two metal wires with length b are intercepted, the remaining metal wires are 0.4m shorter, and if two metal wires with length a are intercepted, they are 2m shorter. How many meters is the length a?
22. A company wants to transport two kinds of building materials, A and B, to the construction site. Building materials A weigh 700kg each, including 120 * * *, and building materials B weigh 900kg each, including 80 * * *. It is known that a car can transport up to 4 tons at a time, so how many times do five identical cars have to be transported at the same time?
23. The distance from Wang Lijia to the school is longer than the distance to the gymnasium 1/4. One day, Wang Li watched the game in the gym and walked home in 17 minutes. After a short rest, it took him 25 minutes to walk to school, which was slower than coming back from the gym 15 meters. How far is it from Wang Lijia to school?
24. Master and apprentice cooperate to complete a project. Because of their good cooperation, the master's work efficiency has been improved110, and the apprentice's work efficiency has been improved 1/5. After six days of cooperation, two-fifths of the whole project was completed, and then the apprentice worked alone for six days. At this time, the project still has 65438+.
25. Students in five classes of Grade Six planted 65,438+000 trees. As we all know, the number of trees planted in each class is different, and the ranking from the most to the least is just 1, 2, 3, 4 and 5 classes. It is also known that the number of trees planted in 1 is the sum of the number of trees planted in Class 2 and Class 3, and the number of trees planted in Class 2 is the sum of the number of trees planted in Class 4 and Class 5.
26. A runs 13 km per hour, B runs 1 1 km per hour, and B runs 20 minutes longer than A. As a result, B runs 2 km longer than A. How many kilometers did B run?
27. There are two cylindrical containers, A and B, with inner diameters of 6 cm and 8 cm respectively. Container A is full of water and container B is empty. All the water in container A was poured into container B, and the water depth in container B was measured to be 2 cm lower than 7/8 of the container height. What is the height of the container?
28. The cargo 104 tons is transported by 9-ton truck. It is known that a car needs 1 hour for each round trip. In fact, every time the car is loaded 1 ton, it can be completed a few hours in advance.
29. On the first day, master and apprentice processed 225 parts, and on the second day, new technology was adopted. The number of parts processed by the master increased by 24% compared with the first day, and the number of apprentices increased by 45%. Two people processed 300 parts. How many parts did the master process the next day? How many parts did the apprentice process?
30. Struggle Primary School organizes sixth-grade students to go camping and training in Baihua Mountain, and the journey is increased by 2 kilometers every day. I went for four days and came back for three days. How many kilometers is the school from Baihua Mountain?
Comprehensive Training of Mathematical Application Problems in Primary Schools (04)
3 1. The standard for charging electricity in a certain place is: the monthly electricity consumption does not exceed 50 degrees, and the electricity fee is charged at 50 cents per degree; If it exceeds 50 degrees, the excess will be charged at 80 points per degree. Every month, user A pays 3 yuan and 30 cents more than user B. How many kWh did users A and B use this month?
Master Wang plans to process a batch of parts in two hours. When there were 160 parts left, the machine broke down and the efficiency was lower than before 1/5. As a result, the task was completed 20 minutes later than originally planned. How many parts are there in this batch?
33. Mom gave Honghong some money to buy New Year cards, including three kinds of cards: A, B and C. Each card of A is 1.20 yuan. How much did Mom give Hong Hong to buy one card instead of eight cards B and six cards B? How much is the second card?
34. An old man has five sons and three houses. Before he died, he made a will and gave three houses to his three sons. As compensation, the three sons who were assigned to the house each took out 1.200 yuan and divided it equally among the two sons who were not assigned to the house. Everyone says this distribution is fair and reasonable, so how much is each house worth?
35. Xiaoming and Xiaoyan have less than 20 picture books. If Xiaoming gives Xiaoyan an A, Xiaoming's picture book is twice as big as Xiaoyan's. If Xiaoyan gives it to Xiao Amin, Xiao Ming's picture book is three times as big as Xiaoyan's. How many picture books do Xiaoming and Xiaoyan have?
36. There are three kinds of balls *** 160. If 1/3 of the red ball, 1/4 of the yellow ball and 1/5 of the white ball are removed, 120 remains. If 1/5 of the red ball, 1/4 of the yellow ball and 1/3 of the white ball are removed, 1 16 remains. How many yellow balls are there? (2) How many red balls and white balls are there?
37. My father, brother and sister are all 64 years old now. When my father was three times as old as my brother, my sister was nine years old. When my brother is twice as old as my sister, my father is 34 years old. How old are they now?
38.B is between A and C, and A delivers letters from B to A.. 10 minutes later, B delivers another letter from B. 10 minutes later, C found that A and B had just reversed the two letters, so he rode from B to catch up with A and B in order to transfer the letters. It is known that a and b have the same speed.
39. There are 94 workers in Workshop A and Workshop B, processing 1998 bamboo chairs every day. Due to different equipment and technology, each worker in Workshop A can only produce 15 bamboo chairs per day, while each worker in Workshop B can produce 43 bamboo chairs per day. How many more bamboo chairs does Workshop A produce every day than Workshop B?
40. It takes 10 minutes for Party A to go home from school, and 14 minutes for Party B. It is known that the distance for Party B to go home is 1/6 longer than that for Party A, and Party A walks 12 meters longer than that for Party B every minute. So how many meters is the distance for Party B to go home?
Comprehensive Training of Mathematical Application Problems in Primary Schools (05)
4 1. The cost of a commodity per piece in 72 yuan was originally sold at a fixed price, and 100 pieces can be sold every day, and the profit of each piece accounts for 25% of the cost. Later, it was sold at 90% of the fixed price, and the daily sales volume increased to 2.5 times. According to this calculation, how many yuan does the daily profit increase?
42. The speed ratio of the two trains A and B is 5: 4. The second train leaves from Mile Mile for Station A.. When it is 72 kilometers away from Miley Miley, the first train goes from Station A to Miley Miley Miley. The ratio of the distance between the two trains is 3: 4, so what is the distance between Station A and bilibili?
43. There are 35 monkeys, big and small, who go to pick peaches together. In the absence of the Monkey King, a big monkey can pick 15kg and a small monkey can pick 1 1kg in an hour. When the Monkey King is present to supervise, each monkey, regardless of size, can pick 12kg per hour.
44. There are first prize and second prize in the math contest. It is known (1) that the ratio of winners in two schools is 6: 5. (2) The sum of the winners of the two schools in the coming year will account for 60% of the total winners of the two schools. (3) The ratio of winners of the two schools is 5: 6. Ask a school to win the second prize.
45. It is known that the walking speed ratio of Xiaoming and Xiao Qiang is 2: 3, and that of Xiao Qiang and Xiaogang is 4: 5. It is known that Xiao Gang walks 420 meters more than Xiao Ming in 10 minute, so how many meters does Xiao Ming walk less than Xiao Qiang in 20 minutes?
46. It was originally planned to process 15 pieces a day, which could be completed in a few days. When 3/5 of the processing tasks are completed, the efficiency is improved by 20%. Therefore, the task was completed 65,438+00 days ahead of schedule. How many parts are there in this batch?
47.a and B competed in the10000m race on the 400m circular track. They started from the same starting point at the same time. At first, the speed of A was 8m/s, and the speed of B was 6m/s. Every time I caught up with B, the speed of A dropped by 2m per second, and the speed of B dropped by 0.5m per second. This continued until A found B catching up from behind for the first time.
Xiao Ming goes to school from home. If he walks 1.5km more every hour than before, he only needs 4/5 of the original time. If he walks 1.5km less per hour than before, how long will it take him to walk this section?
49. A, B, C and D are all 64 years old now. When a is 2 1 year, b is1year; When A/Kloc-0 was 8 years old, C was three times that of D. How old is D now?
50. A batch of parts was originally planned to process 30 pieces a day. When processing 1/3, due to the improvement of technology, the work efficiency increased by 10%, and the task was completed four days ahead of schedule. How many parts are there in this batch?
Comprehensive Training of Mathematics Application Problems in Primary Schools (06)
5 1. The escalator runs upward at a constant speed. A boy and a girl walked up the escalator at the same time. Boys are twice as fast as girls. It is known that the boy took 27 steps to reach the top of the escalator, while the girl took 18 steps to reach the top. How many steps are there in the exposed part of the escalator?
52. Two piles of apples are the same weight. The first pile sells for 2/3, and the second pile sells for 50 kilograms. If there are fewer apples left in the first pile than in the second pile, how many kilograms are left in the two piles?
53. Two cars, A and B, start from place A at the same time and travel between place A and place B. It is known that the speed of car A is faster than that of car B. After the first and second encounters of the two cars, they mix with place C. What is the speed of car A?
54. The ship went back and forth from A to B for two hours, and it came back smoothly, 8 kilometers faster than when it went, so the second hour was 6 kilometers longer than the first one. Find the distance between a and B.
55. Two cars, A and B, start from A and B respectively, and keep going back and forth between A and B. It is known that the speed of A car is 15km/h, and the difference between the third venue and the fourth venue of A and B is 100km. Find the distance between a and B.
56. Someone walked along the moving escalator from top to bottom for 7 minutes and 30 seconds, while he only walked along the escalator from bottom to top for 1 minute and 30 seconds. If this person doesn't walk, how long does it take to take the escalator from bottom to top? If there is a power failure, how long will it take this person to walk from the bottom to the top along the escalator?
57. The bottom area ratio of two cylindrical containers A and B is 5: 3. The water depth of container A is 20 cm, and that of container B is 10 cm. Then, the same amount of water is injected into the two containers to make the water depth in the two containers equal. How many centimeters is the water depth at this time?
58. The distance between A and B is 207 kilometers. Two cars, A and B, leave from A to B at 8: 00 at the same time, with speeds of 60 km/h and 54 km/h respectively. Car C leaves from B for A at 8: 30 at a speed of 48km/h. What time is it when the distance between car C and car A and car B is equal?
59. The circumference of a rectangle is 130 cm. If its width increases by 1/5 and its length decreases by 1/8, a new rectangle with the same circumference will be obtained. Find the area of the original rectangle.
60. There is a rectangle with an aspect ratio of 5: 2 and a diagonal of 29 cm. Find the area of this rectangle.
Comprehensive Training of Mathematical Application Problems in Primary Schools (07)
6 1. There is an orchard. Last year, there were 60 more fruit trees than those that did not bear fruit. There are 160 fruit trees bearing fruit this year. At this time, the number of fruit trees that bear fruit is exactly five times that of those that do not bear fruit. How many fruit trees are there in the orchard?
62. Xiaoming walks from A to B, while Li Gang walks from B to A on a motorcycle. 48 minutes later, they met. Li Gang returned to B immediately after arriving at A, and caught up with Xiao Ming 16 minutes after the first meeting. If Li Gang kept going back and forth between A and B, how many times did Li Gang catch up with Xiao Ming when he got to B?
63. Go 100 meters, Xiaoming will go 180 steps, and Dad will go 120 steps. Father and son set out from the same place and the same direction at the same time. If it takes the same time to walk every step, how many steps does his father have to take to come back after walking 450 meters?
64. A ship sails between two ports at a speed of 6 kilometers per hour. It takes 4 hours to sail downstream and 7 hours to sail upstream. Find the distance between two ports.
65. There are three cars, A, B and C. Each car runs from A to B at a certain speed. B leaves later than C 10 minutes, and catches up with C 40 minutes after departure; A leaves later than B 10 minutes, and catches up with C after 60 minutes. How many minutes did A catch up with B?
66. Party A and Party B cooperate to complete a job. Thanks to their good cooperation, Party A's work efficiency is improved by110, and Party B's work efficiency is improved by 1/5. Party A and Party B cooperated for 6 hours to finish the work. If Party A does it alone, it needs 1 1 hour.
67. Five students, A, B, C, D and E, stood in a horizontal row with 20 flags in their hands. Now we know that the students standing on the right of C * * are holding 1 1 flags, and the students standing on the left of B * * are holding1flags. How many flags are there in each?
68. Xiaoming ran a circle on the 360-meter-long circular runway. He is known to run 5 meters per second in the first half and 4 meters per second in the second half. How long did it take him in the second half?
In order to measure the length and speed of the passing train, Xiaoying and Xiaoming took two stopwatches. Xiaoying used one watch to record the train passing in front of him for 15 seconds, and Xiaoming used another watch to record the train passing from the first telephone pole in front and the second telephone pole in the back for 18 seconds. Knowing that the distance between two telephone poles is 60 meters, we can find out the total length and speed of the train.
70. Xiaoming walks from home to school in the first half and rides a bike in the second half. Go home from school, take the bus for the first time 1/3, and walk for the second time 2/3. As a result, I spent 20 minutes more time at school than at home. How many kilometers is Xiaoming's distance from home to school?
Comprehensive Training of Mathematical Application Problems in Primary Schools (08)
7 1. Math exercise * * * was held for 20 times, and * * * gave 374 questions. The number of questions generated each time is 16, 2 1, respectively 16, 2 1, and how many times are 24 questions?
72. Divide an integer by 2 to get 1, divide the obtained quotient by 5 to get 4, and then divide the obtained quotient by 6 to get 1. What is the remainder when this integer is divided by 60?
73. Young Pioneers planted twice as many apple seedlings as pear seedlings on campus. If each race has three pear seedlings, there will be two left. If everyone plants seven apple saplings, there will be six fewer. How many young pioneers are there? How many apples and pears are there?
74. A person has to walk 200 kilometers from City A to City B by car. At first, he was driving at a speed of 56 kilometers per hour, but it took him half an hour to stop to repair it because of the car failure. In order to arrive on time, he had to increase the speed to 1.4 km per hour. After running, how many kilometers is the place where he repaired the car from A city?
75. Two people, A and B, set out from A and B at the same time and walked towards each other. The speed of B is 2/3 of that of A. After they meet, they move on. When A arrives at B, B returns immediately. It is known that the place where they met for the second time is 3000 meters away from the place where they met for the first time. Find the distance between a and B.
76. A ship is sailing between Port A and Port B. It is known that the speed of the ship in still water is 9 km/h, and the ratio of the time spent in retrograde and forward is 2: 1. One day, because of the rain, the water flow was twice as fast as before. It takes 10 hour for the shuttle to go back and forth. What is the distance between port A and port B?
77. A school entrance examination, admission scores. Among the students who applied, only 1/3 was admitted, and the average score of the admitted students was 6 points higher than the admission score. The average score of students who are not admitted is lower than the admission score 15, and the average score of all candidates is 80. What is the admission score?
78. A group of students moved bricks. If 12 people move 7 bricks each, and the rest move 5 bricks each, then the last remaining 148 bricks; If 30 people move 8 pieces each and the rest move 7 pieces each, there will be 20 pieces left in the end. Ask the students * * * How many are there? How many bricks are there?
79. Two cars, A and B, are driving in opposite directions from A and B at the same time. It is known that the speed ratio of A and B is 4: 3, C is between A and B, and the time for A and B to arrive at C is 8 am and 3 pm respectively. When did they meet?
80. In a chess match, the scoring method is: the winner gets 2 points, the loser gets 0 points, and both sides get 1 point. Each player plays against other players once. Now it is known that boys are 10 times as many as girls, but the total score is only 4.5 times as much as girls. How many girls are there? How many points do girls get?
Comprehensive Training of Mathematical Application Problems in Primary Schools (09)
8 1. There are several natural numbers whose arithmetic mean is 10. If the largest one is removed from these numbers, the remaining arithmetic average is 9; If the smallest one is removed, the remaining arithmetic average is 1 1. What are these numbers at most? What is the largest of these figures?
82. There are 35 Young Pioneers in one class and 23 boys in this class. How many girls are young pioneers in this class than boys who are not young pioneers?
83. Xiaodong plans to visit the ape-man site in Zhoukoudian. If he drives at a speed of 40km/h, he will arrive three hours earlier than by bike. If he walks at a speed of 8 km/h, he will arrive five hours later than by bike. How many kilometers is the starting point of Xiaodong from Zhoukoudian?
84. Ship A and Ship B are sailing on the river 90 kilometers apart. If they move in the opposite direction, they will meet in 3 hours; If they go in the same direction, ship A will catch up with ship B in 15 hours. Find the speed of ship A and ship B in still water.
85. There are 90 students in two classes in Senior Two, including 765,438+0 young pioneers, 75% in Class One and 5/6 in Class Two. How many young pioneers are there in Class One than in Class Two?
86. A container has been filled with water, and there are three balls in it. The first time, the small ball sank into the water, the second time, the middle ball sank into the water, and the third time, the middle ball and the big ball sank into the water together. Now we know the amount of water that overflows from the container every time: the first time is 1/2, the second time is, and the third time is.
87. Some people spent 2 hours climbing the mountain and 2.5 hours returning. His climbing speed is 3000m/h, and his downhill speed is 4500 m/h. How many meters does it take to climb the mountain?
88. The length of each raw steel bar is 7.3 meters, and each set of steel bar shelves is made of 2.4 meters, 2. 1 m and 1.5 meters respectively. Now we need to tie 100 sets of steel frames. How many raw materials should be used at least?
89. There is a copper-zinc alloy in which the ratio of copper to zinc is 2: 3. It is now known that after adding 6 grams of zinc, 36 grams of new alloy will be obtained after melting. What is the ratio of copper to zinc in the new alloy?
Xiao Ming usually goes to school on foot. One day, he wanted to do some exercise. He runs fast before 1/3, and jogs in the second half, which is twice as fast as walking. So Xiao Ming arrived at school 35 minutes earlier than usual. How many minutes does it take Xiao Ming to walk to school?
Comprehensive Training of Mathematical Application Problems in Primary Schools (10)
9 1. There are three people, A is three years older than B, and B is two years younger than C. The sum of the three people's ages is 109. Find out the ages of A, B and C respectively.
92. The express train departs from Station A to bilibili at a speed of 60 km/h. After 1.5 hours, the local train departs from Station A in bilibili at a speed of 40 km/h. When the two cars meet, the meeting point is 70 km away from the midpoint of the two stations. How many kilometers are the two stations apart?
93. Bus A and Bus B leave school for the museum at the same speed. It is known that the distance between 8:32 A train and school is three times that of B train, and the distance between 8:39 A train and school is twice that of B train.
94. In a working group, each worker can produce a batch of parts in seven hours by working in his own post. If the positions of workers A and B are reversed, the batch of parts can be completed 1 hour in advance. If workers C and D switch places, other things being equal, they can also be moved forward 1 hour.
95. Make a cuboid with 10 cuboid blocks 7 cm long, 5 cm wide and 3 cm high. What is the minimum surface area of this cuboid?
96. There are only two kinds of tickets for the public circle: individual tickets for 5 yuan, group tickets for 10 people for 30 yuan, and group tickets for 10 or more with a discount of 6.5438+00. (1) According to the above regulations, how much should 45 people from Company A pay to visit the park? (2) How much does it cost for 208 people in Unit B to go to the park to buy tickets according to the above regulations?
97. A, B and C scored 260 points. It is known that 1/3 of grade A and 1/4 of grade B are equal to half of grade C minus 22 points. What's the c score?
98. For a project, Party A and Party B cooperate for four days, and Party B completes it alone for five days. It is known that Party A finishes more than Party B every day 1/30. How many days does it take for Party A and Party B to do this project alone?
99. There are two candles, one is long and the other is short, and they burn at the same time. The sum of their lengths is 56 cm. After they are lit at the same time for a period of time, the length of the long candle is as long as that of the short candle before lighting, and then the short candle is exactly 2/3 of that of the long candle. How long does it take to light a long candle?
100. A batch of apples is packed in 20 baskets on average. If each basket contains 1/9, how many baskets can be saved?
Comprehensive training of mathematical application problems in primary schools (1 1)
10 1. Xiaoming bought 1 pen and spent more than half of the total money he brought, 0.5 yuan; Bought a 1 ballpoint pen and spent less than half of the money left after buying it, 0.5 yuan; I bought 2.8 yuan's notebook again. How much money did 0.8 yuan Xiaoming bring?
102. The son is 6 years old, and the age of the father 10 years ago is equal to the age of the son 20 years later. When the father's age is exactly twice that of his son, what year is it?
103. On a wire with a length of12m, the yellow beetle crawled from the right end to the left end at a speed of15cm per minute at 8: 20; At 8: 30, the red beetle and the blue beetle crawled from the left end to the right end at the speed of13cm and 1 1 cm per minute, respectively. When is the red beetle just between the blue beetle and the yellow beetle?
104. A PLA unit rushed from the station to a certain place to fight floods and rescue. If the speed is increased by 1/9, it will be 20 minutes longer than the scheduled time; If you drive 72 kilometers at the original speed and speed up 1/3, you can arrive 30 minutes ahead of schedule. How many kilometers is the journey of this PLA unit?
105. It takes 4 hours for a boat to go from Pier A to Pier B, and when it comes back, it is more than when it goes downstream 12 kilometers per hour. So the last two hours are18km longer than the previous two hours, so what is the distance between pier A and pier B?
106. The ratio of the number of students in Class A and Class B is 5: 4. If 9 students are transferred from Class B, the number of students in Class A is 2/3 more than that in Class B. How many students are there in Class B at this time?
107. Two piles of coal, A and B, weigh 78 tons, of which 25% are transported from A to B, so the weight ratio of B to A is 8: 5. How many tons of coal are there in each pile?
108. It takes 20 days for Party A to do a job alone, and it takes 12 days for Party B to do a job alone. If the work is done by team A for a few days, then it will be done by team B. Both teams need 14 days. How many days does team A need?
109. A motor factory plans to produce a batch of motors and start producing 50 motors every day. After the planned 1/5 was produced, the work efficiency was improved by 60% due to technical transformation, so the task was completed three days ahead of schedule. How many motors have been produced?
1 10. The divisor of two numbers is greater than 9 and 4. If both the dividend and the divisor are expanded to triple, then the sum of dividend, divisor, quotient and remainder is equal to 2583. What are the original dividend and divisor?
Comprehensive Training of Mathematical Application Problems in Primary Schools (12)
1 1 1. On the straight highway, the distance between A and B is 600 meters. A walks 4 kilometers per hour and B walks 5 kilometers per hour. At 8 o'clock in the morning, they set off from A and B at the same time. 1 minute later, they all turn around and go in the opposite direction, that is, press 65438 in turn.
1 12. There are two engineering teams to complete a project. Team A has a rest 1 day after working for 6 days, and it takes 76 days to finish it alone. Team B has two days off every five days of work, and it takes 89 days for one person to finish the work. According to this calculation, the two teams cooperated, and the construction started from1998165438+129 October, and was not completed until 1999.
1 13. In a math contest, Xiao Wang did 2/3 of the total number of questions, and Xiao Li made five mistakes. Both of them did 1/4 of the total number of questions. How many questions did Xiao Wang get right?
1 14. There are 100 coins (1 minute, 2 points, 5 points). If all 2 points are replaced by equivalent 5 points, the total number of coins becomes 79, and then all 1 minute is replaced by equivalent 5 points, the total number of coins will be 79.
1 15. Two objects A and B move relatively along the circular runway, starting from two points that are150m apart (the length of the small arc on the circular runway). If they move along a small arc, A and B meet at 10 second. If they move along a big arc, they will meet in 14 seconds. As we all know, when A runs,