The latest logic questions look at your intelligence.

1. one day, a customer from Harlan's store picked up 25 yuan of goods. The customer took out 100 yuan and Harlan couldn't find any change, I went to the next-door Apsara Stack store and changed the 100 yuan to the change. I came back and asked the customer for the 75 yuan change. After a while, Fei Bai came to Harlan and said that the fake money was just now. Harlan immediately changed the real money for Fei Bai and asked Harlan how much he lost (low )?

2. How many cats (low) are required to catch 100 mice in 100 minutes at the speed of 5 cats and 5 mice in 5 minutes)

3. 54 cards in a pair, and the possibility of turning two cards in the black half (low)

4. Buy a watch for 100 yuan and sell it for 110 yuan. Buy a watch for 120 yuan and then sell it for 130 yuan. Ask how much money you have earned (low)

5. There is a farm where 27 cattle are known to be raised, and the grass is exhausted in 6 days; 23 cattle are raised, and the grass is exhausted in 9 days. If 21 cattle are raised, how many days can the grass on the farm be exhausted? And keep growing (medium)

4. before entering the restaurant, I handed my hat to the storage department's little sister Bao. When they left, they accidentally handed their hats to the store Department before entering the restaurant. Careless when they leave together
Sister casually put the four hats on everyone's head. After sending the mail, none of them wear their own hats. What is the probability of this situation? What if n people (n> 1) (n> 1) (n> 1) (n> 1) (medium)

7. A and B bought a radio for six yuan, and then a and B bought a radio for six yuan, and then left the store, ding did not leave because he had something to do with them. Then the salesman found that the radio price should be RMB 5, and he returned the money to ding because he had not left, when Ding went back, he took four corners by car, and then took the rest of the corners, then, the remaining six corners were allocated to a and B, and each of them was allocated to A and B, and each of them was allocated to A and B, respectively. At this time, the accounts of A and B, each spent 1.8 yuan, the four corners of Ding's car cost are 5.8 Yuan. Where are the remaining two cents? (medium)

8. There are 50 people in the village, each having a dog. These 50 dogs are ill (the disease is not contagious ). So people need to find the sick dog. Everyone can observe the other 49 dogs to determine if they are ill. Only their dogs can't watch them. If the observed results do not communicate with each other, the owner of the sick dog can be notified that, once he thinks that his/her family is responsible for shooting his/her own dog. In addition, each person has the right to kill his/her dog and has no right to kill others. The first day and the second day were not shot. In the third pass, I asked a few sick dogs how to calculate (medium)

9. Five monkeys found a pile of peaches on the beach and decided to divide them equally the next day. In the early morning of the next day, the first monkey first came, and it was inseparable from the left and right points. It threw one in the sea, which could be divided into five portions. It took one of its parts and went away, 2nd, 3, 4, and 5 monkeys encountered the same problem. They all threw away one of them in the same way,It can be divided into five portions and asked how many peaches there are in total.

10. Neither of the three can speak, but both are very intelligent. Each of them wore a hat, either black or red. All three of them are thinking hard and want to know the color of their hats, but they are never known. One day, a foreigner saw three of them and casually said, "At least one of you has a red hat ." After that, I went away. After hearing this, all three of them went home and thought about it. At noon the next day, the three people still met in the square. Two people announced the color of their hats on the spot, and the third person also knew the color of their hats. Could you tell me, the three men respectively wore hats of what color.

I will post the answer in two days. You should think about it first. Welcome to the post.