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: After a typhoon, 2 trees in Haley's backyard died. If she had grown 12 trees initially 

 Question: How many trees does she have left?
answer:
10


question:
Context: A farmer had 160 tomatoes in his garden. If he picked 56 of them yesterday and 41 today. 

 Question: How many did he have left after yesterday's picking?
answer:
104


question:
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?
answer:

69