Disturbing questions about IQ testing

11. I only heard the question, but I don't know the answer. Is there anyone who knows the complete answer to this disturbing IQ test question?

1. Three people went to sleep for 30 yuan a night. Each of the three paid 10 yuan and paid 30 yuan to the boss. Later, the boss said that the offer for today would be enough for only 25 yuan. The waiter offered 5 yuan to return the offer to them. The waiter secretly hid 2 yuan. Then, the remaining 3 yuan was allocated to the three people, with each person allocated 1 yuan. In this way, at the beginning, each person paid 10 yuan, and now 1 yuan is returned, that is, 10-1 = 9. Each person only spent 9 yuan, and 3 people paid 9 yuan each, 3x9 = 27 yuan + 2 yuan hidden by the waiter = 29 yuan. Where can I find another dollar?

2. Someone went to buy scallions and asked how much the Scallions cost? The seller of scallions said that the price for one piece is 1 Jin. This is 100 jin, and 100 yuan is required. The person who bought the green onion asked: The white onion cannot be sold separately from the green onion. The person who sold the green onion said: Sell, 7 hairs white onion, 3 hairs green onion. All the people who buy scallions have bought them. They say that the scallions are 50 Jin and the scallions are 50 Jin. In the last example, 50*7 equals 35 yuan, 50*3 equals 15 yuan, and 35 + 15 equals 50 yuan. The scallianz buyer gave the scallianz 50 yuan and then left. The scallianz seller wondered why the scallianz sold 100 yuan, why did the scallion buyer buy it for 50 yuan? Why are you saying this?

3. There was a 7-meter-deep well, and a snail shell climbed up from the bottom of the well. It climbed 3 meters during the day and fell 2 meters down at night. How many days can it crawl out of the well?

4. How many peaches can you eat if you have one cent for one peach and three peaches for one peach?

5. There are 12 table tennis balls of the same shape and size. Only one of them has a different weight than the other eleven. Currently, it is required to be called three times by a scale without a weight, find the ball with abnormal weight and know whether it is heavier or lighter than the other eleven balls.

6. A merchant needs to ride a donkey across a 1000-kilometer desert and sell 3000 carrots. It is known that a donkey can carry 1000 carrots at a time, but it will eat 1 carrot every 1 kilometer. Q: How many carrots can a merchant sell at most?

7. It was said that a pirate ship was hit by a cow in the world one day. Five unlucky guys had to escape to an isolated island and found the island alone. Fortunately, there was a coconut tree, there is another monkey! Everyone picked all the coconuts and put them together, but it was very late, so they went to bed first.

In the evening, a guy quietly got up and quietly divided the coconut into five portions. As a result, he found that there was another coconut, and he gave it to the lucky monkey, and then quietly hid it, then we mixed the remaining coconuts and put them back to the original place. Finally, we dropped them back to bed.

After a while, another guy quietly got up and quietly divided the remaining coconut into five portions. As a result, he found that there was one more coconut and he gave it to the lucky monkey, then, a copy of the coconut was removed, and the rest of the coconut was put back to the original place. Finally, the coconut was dropped back to bed. After a while ...... After a while ...... In short, five guys have gotten up and done the same thing.

Everyone gets up in the morning and has a cool child. This monkey is not very lucky because after dividing the coconut into five portions, there is still one more cool, I had to give it again. The question is, how many coconuts are there at least?

8. There is a treasure on an island. You can see three large and small people. You know that the great people know that the treasure is on the hill or below, but sometimes he tells the truth and sometimes tells lies, only the Chinese people know whether they are telling the truth or telling false things, but the Chinese people only tell the truth when they are telling the truth, and the previous people say false things when they are telling the truth, the two islanders show whether or not by raising the left or right hand, but you do not know which hand represents yes or which hand represents no, only the islanders know whether they are true or false, whether they are expressed in language, and whether they are expressed in either left or right hand. But he always tells the truth or tells the truth forever, and you don't know which of the two types he is. Can you ask the treasure on the hill or down the hill with the least questions? (Tip: If you ask where the island folk treasures are hidden, he will ask you how to know where the treasures are? .)

9. How many people have multiple tables in a house? If three people have one table, two more people. If five people have one table, four more people. If 7 people have one table, 6 more people. If nine people have one table, eight more people. If 11 people have a table, that's right. How many people are there in this room?

10. Someone wants to buy a few sets of tableware. After reading it at the tableware store, they find that they can buy 21 forks, 21 spoons, or 28 knives for their money. If the number of forks, spoons, and knives he bought is not uniform, he will not be able to provide a complete set. Therefore, he must buy the same number of forks, spoons, and knives, and just use up his money. What should you do if you are the person?

11. When a thief was detected by a police investigation, the police chased the thief, and the thief ran and ran. There was a river in front, which was 12 meters wide, the river has a tree on the surface of thieves and policemen. The tree is 12 meters tall, and the leaves are all gone. The thief is 6 meters long around his neck. How can the thief cross the river and run?