You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Context: Jesse has 18 square feet of carpet. If her room is 4 feet long and 20 feet wide

Question: How much more carpet does she need to cover the whole floor?
[EX A]: 62

[EX Q]: Context: 28 children were riding on the bus. At the bus stop 82 children got on the bus while some got off the bus. Then there were 30 children altogether on the bus.

Question: How many more children got on the bus than those that got off?
[EX A]: 2

[EX Q]: Context: Paul had 42 pens and 143 books. After selling some books and pens in a garage sale he had 113 books and 19 pens left.

Question: How many pens did he sell in the garage sale?
[EX A]:
23