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: Tiffany was collecting cans for recycling. On monday she had 8 bags of cans. The next day she found 7 more bags worth of cans. 

 Question: How many more bags did she have on monday than she found on the next day?
answer:
1


question:
Context: Nell collects cards. She had 438 baseball cards and 18 Ace cards. She gave some of her cards to Jeff and now has 55 Ace cards and 178 baseball cards left. 

 Question: How many more baseball cards than Ace cards does Nell have?
answer:
123


question:
Context: A farmer had 171 tomatoes in his garden. If he picked 134 of them yesterday and 30 today. 

 Question: How many will he have left after today?
answer:

7