1. Find the pattern and fill in the following numbers: 1, 4,9, 16, (), 36 ... 2,3,5,8, (), 21...
There is a 45-meter-long runway with two colorful flags at both ends. The PE teacher asked to insert a colorful flag every 5 meters on this runway, and also needed colorful flags ().
3. When the caterpillar grows into an adult, it doubles every day. 10 can grow to 10 cm in one day, and it takes () days to grow to 20 cm.
4.ABAB stands for different mathematics, and A = () B = () × 311.
5. The cells in the picture below are all squares, and the * * * in the picture has a () square.
6. There are 20 coins with 2 cents and 5 cents in Qin Wang's savings box, totaling 76 cents, including () coins with 2 cents.
7. One key opens one lock, and now eight keys and eight locks are all messed up. To pair again, try at most () times and at least () times.
8. My brother's age five years ago is equal to my sister's age three years later. When my brother was () years old, it was exactly three times my sister's age
9. From midnight to noon 12, the hour hand and minute hand overlap () times.
10. A piece of wood is 24 decimeters long. If you want to saw a 4-meter-long stick, you need 3 points for each saw, 2 points for rest after saw, and () points for all saws.
1 1. Wang Dong has a deposit in 50 yuan, Zhang Hua has a deposit in 30 yuan, and Zhang Hua wants to catch up with Wang Dong. Wang Dong deposits in 5 yuan and Zhang Hua deposits in 9 yuan every month. It will take () months to catch up with Wang Dong.
12. There were 164 people in the third grade, and 28 people participated in the art interest group. The number of people who participate in music interest groups is twice that of art groups, and the number of people who participate in sports interest groups is twice that of music groups. If everyone participates in at least one interest group and at most two interest group activities, then at least () people will participate in two interest groups.
13. One of the three students, Zhang San, Li Si and Wang Wu, did a good thing for the group while the others were away. Afterwards, the teacher asked who did the good deed. Zhang San said it was Li Si, Li Si said it wasn't him, and Wang Wu said it wasn't him. One of them told the truth, and the one who did good was ().
14. Li finished a story book in 12 days, but must finish it in 2 days. Li Ming reads four more pages than Wang Fang every day. This story book has () pages.
15. A three-digit number, the sum of the numbers on each digit is 15, and the number on the 100th digit is 5 less than the number on the single digit; If the unit and the hundred digits are reversed, the new number is 39 times less than the original number. Then the original three digits are ()