The answer is: put three of the eight coins on the left disk, then put the other three on the right disk and put the remaining two aside. If the two disks are equally heavy, the heavy coin is in the remaining two coins and then weighed. All right. If a disk is heavy, put three coins on this disk, one on the left disk and one on the right disk, and re-measure. If it is equal, the heavy coin is the remaining 60.
The fifth question is about mathematical geometry, which is probably encountered in the second and third day of junior high school. You should know that the manhole cover is on the road, and there must be something to hold it on the edge of the manhole cover so that it won't fall off, and the edge is very small. Then if the manhole cover is round, the radius is equal. If the manhole cover is placed on the side for some reason, the diameter is longer than the edge, so that the manhole cover will not fall off. If the manhole cover is rectangular, it will fall to one side. Because a rectangle is composed of two right-angled triangles, and the hypotenuse of the right-angled triangle is longer. If you say so, equilateral triangles should be ok, and so should some irregular figures. There may be aesthetic factors, or the author of the manhole cover first thought of the round manhole cover, and then there are round manhole covers all over the world, so no one cares why the equilateral triangle manhole cover is not used ... Because of limited knowledge, I asked the teacher why the equilateral triangle could not be used, but the teacher didn't answer me. I can't prove it to you
The seventh question, first think about it. Every second, the minute hand is turning. Then, in the next second of coincidence, will the hour hand and the minute hand overlap again? If you want to go deeper, I think we should consider the degree of the circle. Through calculation, we know that the minute hand goes 6 degrees per minute and the hour hand goes 0.5 degrees. Then, if it is twelve o'clock, the hour hand points to "12", which coincides once, but every second, the minute hand rotates subtly, while the hour hand is there. Personally, I am only a junior three student, which may not be the correct answer. I think 24 hours a day is naturally 24 times.
The eleventh question belongs to reasoning, I don't know (hehe), but there is a similar question on the internet: pirates divide gold coins, and there are five pirates in total. The first one starts to divide the gold coins first. If his distribution method is not passed by half, he will be executed and let the next one divide. There is a detailed answer to this question (I read it a long time ago), and the answer is: reverse thinking.
Assuming that every pirate is extremely intelligent and rational, he can carry out strict logical reasoning and rationally judge his own gains and losses, that is, he can get the most gold coins on the premise of saving his life. At the same time, assuming that the results of each round of voting can be implemented smoothly, what distribution scheme should the pirates who have drawn 1 put forward to avoid being thrown into the sea and get more gold coins?
The accepted standard answer to this question is: Pirate 1 gives No.3 1 gold coins and No.4 or No.5 2 gold coins, and he gets 97 gold coins alone, that is, the distribution scheme is (97,0, 1, 2,0) or (97,0, 1, 0). Now let's look at the following rational analysis:
Let's talk about Pirate No.5 first, because he is the safest and has no risk of being thrown into the sea, so his strategy is also the simplest, that is, if all the people in front are dead, then he can get 100 gold coins by himself.
Next, look at No.4, and his chances of survival depend entirely on the existence of others in front, because if all the pirates from 1 to No.3 feed sharks, No matter what distribution scheme No.4 proposes, No.5 will definitely vote against it and let No.4 feed sharks to keep all the gold coins. Even if No.4 pleases No.5 to save his life and puts forward a plan like (0, 100) to let No.5 monopolize the gold coins, No.5 may think it is dangerous to keep No.4 and vote against it, so that he can feed the sharks. Therefore, rational No.4 should not take such a risk and pin his hope of survival on the random selection of No.5. Only by supporting No.3 can he absolutely guarantee his life.
Look at number three. After the above logical reasoning, he will put forward such a distribution scheme (100,0,0), because he knows that No.4 will unconditionally support him and vote for him, so adding his own 1 vote will make him safely get100 gold coins.
But player 2 also knows the allocation scheme of player 3 through reasoning, so he will propose a scheme of (98,0, 1, 1). Because this scheme is relative to the distribution scheme of No.3, No.4 and No.5 can get at least 1 gold coins. Rational No.4 and No.5 will naturally think that this plan is more beneficial to them, support No.2, and don't want No.2 to go out, so No.3 will be allocated. So number two can get 98 gold coins with a fart.
Unfortunately, One Pirate 1 is not a fuel-efficient lamp. After some reasoning, he also understands the distribution scheme of No.2. The strategy he will take is to give up No.2 and give No.3 1 gold coins, and at the same time give No.4 or No.5 2 gold coins, that is, to propose (97,0, 1 2,0) or (97,0). Because the distribution scheme of 1 can get more benefits for No.3 and No.4 or No.5 than No.2, then they will vote for 1, plus 1' s own 1 ticket, and 97 gold coins can easily fall into the pocket of 1. However, there are no clear conditions for google's question, only that if it wins, perhaps this question does not need logical analysis, but from the perspective of social reality, such as curry favor with good acquaintances.
Question 10 seems to have been read in a book, but I didn't write the answer. I think so, too. Because he doesn't know the number, he can't write it on paper, so he can only confirm it with his mobile phone: ask Bob to call my mobile phone number.
Question 15, I have come up with many answers. There are countless answers to this kind of brain teaser, but the questioner only looks at the correct answer in his hand, so I will give you my most shocking one for reference: if it is only as small as a coin, the stirrer is generally quadrangular and pentagonal when viewed from the plane, and the stirring blade is round when rotating, then why not stand directly at the position where the stirring blade can't cut your dead angle?
The third question, biological explanation, the ratio of male to female students is 1 to 1, because the probability question is only a rough estimate and there is no accurate answer. Candidates just want to see your problem-solving ideas. This is my solution: since it is a ratio of 1, it is either a man or a woman. Because it is a rough estimate, it is considered that there is a man and a woman every two births.
The eighth question, I won't, but there are netizens' opinions on the Internet: For a software engineer, try to avoid "dead beef" in the software. Not only is it not good for the software itself, but it will also bring damage to the whole software. Dead beef is not only inedible, but also attracts many pests such as warehouse flies.
Most other questions are subjective, and there is no absolute answer. The questioner just wants to see your thoughts. But I've told you everything I can. It's no use just looking at the answer. The key is analysis. I hope the long speech I spent 1 hour can help you.
References:
Baidu God, the teacher's inculcation