-1- IQ test (answer attached) (1) A well-dressed female customer saw a diamond ring in a jewelry store. After bargaining with the shopkeeper, she agreed to the price of 8000 yuan. The female customer took out a bill of 10000 yuan. In order to get back the change, the owner of the jewelry store took this bill to the grocery store next door to change it, and then gave the customer more than 2000 yuan. After a while, the grocer found that the bill was false and the customer had left with a diamond ring. In desperation, the jewelry store owner had to admit that he was unlucky and took out 10000 yuan to compensate the grocery store owner. If the value of the diamond ring is still calculated according to the selling price of 8000 yuan, then the jewelry store owner will lose money in this business? (1) 8000 yuan (2) 10000 yuan (3) 12000 yuan (4) 18000 yuan (5) 20000 yuan (2) Hu Shengli, a native of Chongqing, on a long-term business trip. One day in April, my wife was alone at home and was killed by a thief at night. It was raining lightly that night and people found a fan in the mud. The inscription above was given to Li Qian by Wang Ming. Wang Ming doesn't know who it is, but everyone knows that Li Qian is not serious in his words and deeds at ordinary times, so everyone in the village thinks he killed him. He was arrested and tortured in court, and he admitted it. The case has been decided. One day, the judge's wife smiled and said to him, "This case was wrongly decided." So, after saying a word, the magistrate was convinced, so he went to the criminal and got the truth of the matter. (3) Here are eight identical balls, one of which is lighter than the others. I'll give you a scale, but it has no weight. I want you to weigh it twice and find the lightest one. (4) A manager has three daughters, and their ages add up. The age of the three daughters is multiplied by the manager's own age. A subordinate knows the manager's age, but he still can't determine the ages of his three daughters. At this time, the manager said that only one daughter's hair was black, and then the subordinates knew the age of the manager's three daughters. What are the ages of the three daughters? (5) There are two unevenly distributed incense sticks, and the burning time of each incense stick is one hour. What method can you use to determine the time of 45 minutes? (6) The Death of a Female Detective A British private female detective was shot dead at the Regal Hotel where she stayed when she came to Thailand to investigate a gang murder. The nearby sheriff rushed to the scene with his assistant and saw the female detective lying under the window, shot twice in the chest and holding a lipstick in her hand. The sheriff opened the curtain and saw a line of numbers written in lipstick on the glass: 809. I also found a tightly rolled note from the handbag, which read: "Three suspects have been found, and one of them is the murderer. These three people are: optical code 608, island code 906 and help code 806. " The sheriff pondered for a moment, pointed to a person on the note and said, "The murderer is him!" " "According to the sheriff's inference, the police quickly arrested the murderer. Excuse me, who is the murderer? Why?

-6- Answer: (1)B (2) My wife was killed in April, and it rained at night. The weather is definitely still a little cold, so there is no need for a fan. Where did you take this thing when you killed someone? Obviously to frame someone. (3) Randomly select six balls for the first time and put three balls on the balance. If they have the same weight, weigh the remaining two balls again and you will know the result. If their weights are different, choose two lighter balls from the three and put them on both sides of the balance, and the result will come out naturally. (4)1+5+7 =13,1* 5. (6) The murderer is the light with code number 608. Because the female detective handwritten 608, the number arrangement changed, and the positive and negative order was reversed, and 608 became 809.