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Mathematical thinking problems in grade three
1, with three numbers, can form six different three digits. The sum of these six digits is equal to 1998, so what is the largest three digits?

Answer: 62 1

2. There are 180 white pieces and 18 1 black pieces in a box. Where is the white chess piece of 18 1? Zhang Yu randomly draws two pieces from box A at a time. If the two pieces are the same color, he takes out an albino from box B and puts it in box A; If the two pieces are different colors, he will put the sunspot home. How much did he take? After that, there is only one piece left in the armor box.

Answer: No matter what kind of chess pieces are taken out of the armor box, there is one missing from the armor box. The original 36 1 in the armor box was missing one at a time, and one remained after 360 times.

Grandpa is seven times as big as Mingming now, six times as big as him in a few years, five times, four times and three times as big as him in a few years. Ask grandpa how old he is now.

Answer: 70 years old

There are three kinds of drinks and 65 bottles of three kinds of drinks. On average, two people drink a bottle of A drink, three people drink a bottle of B drink and four people drink a bottle of C drink. How many people attended the party?

Answer: 60 people

There are several trained militiamen in the queue. Only the number is (90- 1 10), there is no surplus in the third row, less than two in the fifth row and less than four in the seventh row. * * How many militia are there?

Answer: 102 people

6. Buying books with 2 16 yuan just ran out of money. If the price of each book is reduced by 1 yuan, you can buy three more books, which just runs out of money. * * * How many books did you buy?

Answer: 24 books

7. 100m Plant a tree every 2 meters on both sides of the road. These trees are planted from one end of each side according to the rule of planting two fir trees first and then 1 willow tree. How many willows are there in these trees?

Answer: 34 trees

8. Choose 1 from 9 students as the monitor and 4 as the team leader. How many ways can I choose a * *?

Answer: 630 kinds.

9. The clerk changed a 5 yuan and a 50-cent RMB into 28 RMB with face value of 1 yuan and 1 minute. How much RMB do you want in return?

Answer: There are three Zhang Yiyuan bills and 25 dimes.

1There are 400 movie tickets in 0.3 yuan, 5 yuan and 7 yuan. A * * * value of 1920 yuan, in which 7 yuan and 5 yuan tickets are equal. How many movie tickets are there for each of the three prices?

Answer: 3 yuan has 160, and 7 yuan and 5 yuan have 120.

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