TASK DEFINITION: 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.
PROBLEM: 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?

SOLUTION: 20

PROBLEM: Context: David did 51 push-ups in gym class today. David did 49 more push-ups than Zachary. 

 Question: How many push-ups did Zachary and David do altogether?

SOLUTION: 53

PROBLEM: 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?

SOLUTION:
20