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.
Example: Context: Sam is 6 feet tall and Alex is 5 feet tall 

 Question: By how many feet is Sam taller than Alex? 
Example solution: 1
Example explanation:  Sam's height - Alex's height = 6-5 = 1

Problem: Context: Rachel had to complete 5 pages of math homework and yet more pages of reading homework. If she had to complete a total of 7 pages of homework 

 Question: How many pages of reading homework did she have to complete?

Solution: 2