Answer: 2 yuan.
2. Suppose there is a pond with infinite water. At present, there are two empty kettles with a capacity of 5 liters and 6 liters respectively. The problem is how to get 3 liters of water from the pond with only these two kettles.
Answer: Fill a 5-liter pot and pour it into a 6-liter pot. Then pour it into a 6-liter pot until it is full. At this time, there are 4 liters of water left in the 5-liter pot. Pour all the water out of the 6-liter pot and pour the remaining 4 liters into the 6-liter pot. At this time, there are only 4 liters of water in the 6-liter pot. Then fill the 5-liter pot and pour it into the 6-liter pot until it is full. At this time, 5
3. A farmer took three rabbits to the market to sell. Each rabbit weighs about three or four kilograms, but the farmer's scale can only weigh more than five kilograms. He asked him what he called it.
Answer: weigh three first, then take one, and then calculate the difference after weighing.
A monkey picked 100 bananas in the forest and piled them up. The monkey's house is 50 meters away from the banana pile. The monkey is going to carry bananas home. He can carry up to 50 bananas at a time. However, monkeys are greedy and want to eat a banana every meter. How many bananas can this monkey take home at most?
Answer: 25, first recite 50 to 25 meters. At this time, eat 25, and then 25, put it down. Go back and recite the remaining 50. At 25 meters, I ate 25 more, and there are 25 more. Then pick up 25 roots on the ground, 50 of them, and continue to walk home. A ***25 meters, you have to eat 25, and there are 25 left to get home.
There used to be 12 lighted candles on the table. First three were blown out by the wind, and then two were blown out by a gust of wind. Finally, how many candles are left on the table?
Answer: 5 pieces.
6. Brother * * * has 45 yuan. If the eldest brother increases 2 yuan's money, the second brother decreases 2 yuan's money, the third brother triples it and the fourth brother reduces it to 1/2. At this time, four people have the same amount of money. How much money do they have?
Solution: Boss 8, Raul 12, Raul 5, Raul 20.
7. A rope has two heads. How many heads do three and a half ropes have?
Solution: 8 heads, (half a rope is also two heads)
For a residential building, it takes Grandpa six minutes to walk from the first floor to the third floor. Now it takes him six minutes to walk to the sixth floor.
A: 15 minutes
8.24 people are arranged in 6 rows, and 5 people are required to be in one row. Do you know how to arrange them? (hexagon)
9. The park bought back a batch of small toys. 10 for each group, minus 2 points; If each group is 12, then you have just finished scoring, but you will lose one group. Please think about it. How many toys does a * * * have? (This batch of toys ***48)
10. There is a book that both brothers want to buy. Brother is short of 5 yuan, brother is short of 1 point. But two people buy books together, and the money is still not enough. Do you know the price of this book? How much money do they each have? The price of this book is 5 yuan. My brother doesn't have any money. My brother has 4.9 yuan.
1 1. A family has four brothers and sisters. The ages of the four of them add up to exactly 14. Do you know how old they are? (Of course, the age here is an integer. ) (14 can only be decomposed into 2 and 7, so the ages of four people are 1, 1, 2,7, and one of them is a twin).
12. 1 Fold the rope in half, then fold it in half, then fold it in half for the third time, and then cut it in the middle. * * * is cut into many segments?
Solution: Paragraph 9
13. When five straight lines intersect, how many intersections can there be at most?
Solution: 10 intersections
14. Member (type a mathematical noun)-the center of the circle
15. If there are five cats and eat five fish at the same time, it will take five minutes to finish. It takes () minutes for 100 cats to eat 100 fish at the same speed.
Solution: 5 minutes
16. There is a long staircase in front of you. If you take 2 steps, you will finally get 1 step; If you take three steps, you will end up with two; If you take 5 steps, you will end up with 4 steps; If you take six steps, you will eventually take five. Only after seven steps, it is just over, and there is nothing left. Please calculate, how many steps does this ladder have?
Solution: 1 19 order
17. Medical branch (A mathematical term)-formula
18. Recruit actors (type a mathematical noun)-make up the corner
20. Move in and count (type a mathematical term)-operation
2 1. You look forward to me, and I look forward to you (using a mathematical noun)-equality.
22. North (hit a mathematical noun)-inverse ratio
23. Count from the back (type a math noun)-Countdown
24. Small house (A mathematical term)-interval
25. Completely cost-effective (to use a mathematical noun)-absolute value