instruction:
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.
question:
Context: Jerry had 7 books and 3 action figures on a shelf in his room. Later he added 2 more action figures to the shelf.

Question: How many more books than action figures were on his shelf?
answer:
2

question:
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?
answer:
13

question:
Context: 52 campers went rowing in the morning. 61 campers went rowing in the afternoon.

Question: How many more campers went rowing in the afternoon than in the morning?
answer:
9