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: Dan has $ 4. He bought 99 candy bar for $ 3 each one costing the same amount of money.

Question: How much money is left?
[EX A]: 1

[EX Q]: Context: Julia played tag with 8 kids on monday, 11 kids on tuesday and 9 kids on wednesday.

Question: How many more kids did she play with on tuesday than on wednesday?
[EX A]: 2

[EX Q]: Context: Paul had 108 books and 55 pens. After selling some books and pens in a garage sale he had 66 books and 59 pens left.

Question: How many books did he sell in the garage sale?
[EX A]:
42