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.

Ex Input:
Context: Winter is almost here and most animals are migrating to warmer countries. There are 38 bird families living near the mountain. If 47 bird families flew away to africa and 94 bird families flew away to asia

Question: How many more bird families flew away to asia than those that flew away to africa?

Ex Output:
47

Ex Input:
Context: Every day Ryan spends 2 hours on learning english, 5 hours on learning chinese and 4 hours on learning spanish.

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

Ex Output:
1

Ex Input:
Context: Zachary did 51 push-ups in gym class today. David did 22 more push-ups than Zachary. John did 4 push-ups less than David.

Question: How many push-ups did John do?

Ex Output:
69