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: Last week Fred had 19 dollars and Jason had 16 dollars. They washed cars over the weekend and now Fred has 40 dollars and Jason has 69 dollars. 

 Question: How much money did Fred earn over the weekend?

SOLUTION: 21

PROBLEM: Context: Katie had 57 new games and 39 old games. Her friends had 34 new games. 

 Question: How many more games does Katie have than her friends?

SOLUTION: 62

PROBLEM: Context: 5 storks and 3 birds were sitting on the fence. 4 more birds came to join them. 

 Question: How many more birds than storks are sitting on the fence?

SOLUTION:
2