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: Rachel had to complete 7 pages of math homework. If she had to complete 4 more pages of math homework than reading homework 

 Question: How many pages of reading homework did she have to complete?
[A]: 3


[Q]: Context: A book has 3 chapters. The first chapter is 35 pages long the second chapter is 18 pages long and the third chapter is 3 pages long. 

 Question: How many more pages does the second chapter have than the third chapter?
[A]: 15


[Q]: Context: Mary is baking a cake. The recipe calls for 14 cups of flour and 6 cups of sugar. She already put in 5 cups of flour. 

 Question: How many more cups of flour than cups of sugar does she need to add now?
[A]:
3