1. a bucket of water, pour out half of it for the first time, then pour it back into the bucket for 30kg, pour out half of the water left in the bucket for the second time, and pour out 180kg for the third time, with 80kg left in the bucket. How many kilograms of water are there in the bucket?

2. There are 200 books on the shelves A and B, and the number of books on the shelf A is 3 times less than that on the shelf B, 16 less. How many books are there on shelves A and B?

3. The sum of the ages of A, B and C is 94 years old. A is twice as old as C, five years old, and B is twice as old as C 19 years old. Q: How old are A, B and C?

4. Xiao Fang went to the stationery store to buy 13 Chinese books and 8 arithmetic books, and spent 10 yuan. As we all know, the price of six Chinese books is equivalent to the price of four arithmetic books. Q: How much are 1 Chinese books and 1 arithmetic books?

You can make do with these ~ ~ ~ I don't know if it will be a bit out of line.

Hope to adopt ~ ~ ~