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: Every day Ryan spends 6 hours on learning english 3 hours on learning chinese and 58 hours on learning spanish. 

 Question: How many more hours does he spend on learning english than he does on learning chinese?

SOLUTION: 3

PROBLEM: Context: A book has 2 chapters across 81 pages. The second chapter is 68 pages long. 

 Question: How many pages are in the second chapter?

SOLUTION: 13

PROBLEM: Context: Josh had 20 marbles in his collection. He gave 2 marbles to Jack. 

 Question: How many marbles does Josh have now?

SOLUTION:
18