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.

[Q]: Context: Paul had 2 books. After selling some in a garage sale he bought 150 new ones. If he has 58 books now 

 Question: How many books did he sell?
[A]: 94


[Q]: Context: Danny collects bottle caps and wrappers. He found 82 wrappers and 29 bottle caps at the park. Now he has 42 bottle caps and 61 wrappers in his collection. 

 Question: How many bottle caps did danny have at first?
[A]: 13


[Q]: Context: Every day Ryan spends 6 hours on learning english and 2 hours on learning chinese. 

 Question: How many more hours does he spend on learning english than he does on learning chinese?
[A]:
4