1. I borrowed 500 from my father, 500 from my mother, and spent 970 on a pair of leather shoes. I left 30 yuan, 10 yuan for my father, 10 yuan for my mother. I saved myself 10 yuan. I owe my father 490, my mother 490, (eight-character marriage) 490490=980. Add your own 10=990. Where is the other 10?
2. Pupils' puzzles: Close your eyes and catch colored balls. There are a bunch of colored glass balls, yellow, green and red. If you close your eyes and want to catch two glass balls of the same color, how many can you catch at most to ensure that there are two glass balls of the same color?
3. Math puzzle: Calculate the ages of three daughters. Wang Si has three daughters. The ages of the three daughters add up to 13, and the ages of the three daughters add up to Wang Si's own age. One person already knows Wang Si's age, but still can't determine the ages of Wang Si's three daughters. At this time, Wang Si said that only one daughter had black hair, and then the man knew the ages of Wang Si's three daughters. May I ask the ages of the three daughters? Why?
4. Puzzle math problem: The kindergarten teacher asked the kindergarten children to line up and then began to hand out fruits. The teacher's method of distributing fruit is this: starting from the first person on the left, every two people will be given a pear; Starting from the first person on the right, give an apple to every four people. If the distribution results in 10 children getting pears and apples at the same time, how many children are there in this kindergarten?
5. Three people went to a hotel. Three people went to a hotel and stayed in three rooms. Every room 10 yuan, so they paid the boss 30 yuan. The next day, the boss thought that $25 was only enough for three rooms, so he asked his brother to return $5 to three guests. Who knows that my younger brother was greedy for a while. He only returned 1 dollar to everyone, secretly took 2 dollars, and let the three guests spend 9 dollars each, so the three people spent 27 dollars, and the younger brother didn't take 2 dollars and 29 dollars. But at the beginning, the three of them offered 30 dollars, so how about 1 dollar?
Answer: 1. You got a pair of 970 shoes, 10 yuan, and the money you owe your parents is ***980.
2. Catch 4 at most, because the number of glass balls is greater than the color type, and the colors must be repeated.
Wang Si's three daughters should be 2 years old, 2 years old and 9 years old. Because only one child has black hair, that is, she is the only one who has grown up. The other two children are still young, that is, less than 3 years old, and their hair is relatively light. Considering Wang Si's age, they should be at least 25.
4. 158 children. Thinking: 10 The minimum number of pears and apples for children is (21) (41) (1kloc-0/)1=136, and then it extends outward from the left and right ends. Suppose both pears and apples get "1", then the extension numbers on the left and right are: 35-3= 12, 35-5= 10. So the total number of people is1361210 =158.
5. Solution: Actually, the tenant did pay 27 yuan, but there was something wrong with 30 yuan's algorithm. Here, the concept has been changed. There is nothing wrong with 10 multiplied by 3 equals 30; Everyone gets back 1 yuan, and 9 yuan is good. The boss took 25 yuan and returned it to 5 yuan. Total ***30 yuan is no problem; There is nothing wrong with paying 30 yuan and getting 27 yuan back from 3 yuan. Guests take 5 yuan, check-in takes 3 yuan, and check-in takes 2 yuan. No problem. The tenant paid 27 yuan, and the boss 25 yuan's younger brother 2 yuan was right; But now you have to add 27 and 2 to get 30. Of course it's wrong! Smart. Look. Reference answer: it should be reduced by 27 yuan instead of 2 yuan; Not a dollar less.