1: Insert a bamboo pole into the bottom of the water. The bamboo pole is 40cm wet, and then insert the bamboo pole upside down into the bottom of the water. At this time, the wet part of the bamboo pole is longer than half of it 13 cm. So how many centimeters is the total length of the bamboo pole?

2. A container 3 cm long, 2 cm wide and 8 cm high is filled with water. Pour it into a cubic container with a side length of 4 decimeters. How deep is the water?

3: Pour water into an empty bottle with a cup. If you pour 3 glasses of water, the bottle will weigh 440 grams. If you pour 7 glasses of water, the bottle will weigh 600 grams. How much does a glass of water and an empty bottle weigh?

Mom sews buttons for a batch of coats. If 15 pieces are sewn every day, it will be finished 2 days later than the specified construction period; If 18 pieces are sewn every day, it can be completed 3 days ahead of the specified construction period. How many coats are there in this batch?

: 5: Accommodation is arranged for a meeting. If there are 2 people in each room, 14 people have no beds; If there are three people in each room, there will be two more empty beds. Q: How many dormitories are there? How many representatives attended the meeting?

6. There are three times as many football as volleyball in the sports room of Chen Dong primary school. If each class borrows 6 footballs and 5 volleyballs, there are 72 footballs when you borrow volleyball. So the football and volleyball in the sports room are the same?

7: A row of 25 telephone poles on the expressway. The distance between every two adjacent poles used to be 45 meters, but now it must be changed to 60 meters. Can you have a root and not move?

8. There are two four-digit numbers, and their difference is 1996. We call these two four-digit numbers a number pair, such as 32 10 and1214,8059 and 6063. How many pairs of such figures are there?