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: 15 campers went rowing in the morning. Some more campers went rowing in the afternoon. If a total of 32 campers went rowing that day

Question: How many campers went rowing in the afternoon?
answer:
17

question:
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?
answer:
3

question:
Context: Lucy went to the grocery store. She bought 10 packs of cookie and 4 packs of cake.

Question: How many more packs of cookie did she buy over cake?
answer:
6