2. The school bought 80 boxes of white chalk and colored chalk, 60 boxes of white chalk, and how many boxes of colored chalk?

Obviously, I have to do 30 math problems a day, and I have already done 8. How many more questions do you have to do?

4. The school sports group skipped rope 18 and bought 22 pieces. How many are there now?

The breeder keeps 45 white rabbits and 25 gray rabbits. I sold 15 rabbits. How many rabbits are left?

6. The kindergarten bought 45 red balloons and the same number of flower balloons. How many balloons did a * * * buy?

Xiao Liang picked 37 apples and her sister picked 48. How many apples did they pick?

8. The bear made 29 flowers and the elephant made 38 flowers. How many flowers did they make together?

How much more elephants produce than bears?

9. There is a basket of apples. After eating 15 apples, there are 37 apples left. How many apples are there in this basket?

Class 1 boys 10, girls 24. How many people are there in this class? How many boys are less than girls?

1 1. The outer ring line of a city is 72 kilometers long, and the central ring line is 37 kilometers less than the outer ring line. How many kilometers is the Central Line?

12, my sister has walked 38 meters to school, and it is still 62 meters away from school. How many meters does my sister walk to school every day?

13. There are 30 popsicles in the refrigerator, and 20 have been eaten. How much is left? How many cigarettes did you eat more than others?

15, Xiao Jing is 7 years old and her mother is 34 years old. Eight years later, how old is her mother?