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.

Context: Rachel's tree had 4 apples initially. She picked some apples and now there are 2 apples left on the tree. 

 Question: How many apples did rachel pick?
2

Context: Paco had 40 sweet cookies and 25 salty cookies. He ate 28 salty cookies and 15 sweet cookies. 

 Question: How many more salty cookies than sweet cookies did he eat?
13

Context: A book has 2 chapters. The first chapter is 60 pages long. If there are a total of 93 pages in the book 

 Question: How many pages are in the second chapter?

33