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: David did 56 more push-ups than Zachary in gym class today. If David did 38 push-ups 

 Question: How many push-ups did Zachary and David do altogether?
[A]: 20


[Q]: Context: Paco had 37 sweet cookies and 11 salty cookies. He ate 5 sweet cookies and 2 salty cookies. 

 Question: How many more sweet cookies than salty cookies did he eat?
[A]: 3


[Q]: Context: Every day Ryan spends 7 hours on learning english, 2 hours on learning chinese and 4 hours on learning spanish. 

 Question: How many more hours does he spend on learning english than he does on learning spanish?
[A]:
3