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: Danny collects bottle caps and wrappers. He found 11 bottle caps and 28 wrappers at the park. Now he has 68 bottle caps and 51 wrappers in his collection. 

 Question: How many more wrappers than bottle caps did danny find at the park?
answer:
17


question:
Context: Danny collects bottle caps. He threw away 6 of the old ones at the park while he found 50 bottle caps new ones. Now he has 60 bottle caps in his collection. 

 Question: How many more bottle caps did danny find at the park than those he threw away?
answer:
44


question:
Context: A farmer had 105 green tomatoes and 71 red tomatoes in his garden. If he picked 137 tomatoes 

 Question: How many tomatoes are left?
answer:

39