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 4 bags of cans. The next day she found some more bags worth of cans. If she had a total of 6 bags altogether 

 Question: How many bags did she find on the next day?
answer:
2


question:
Context: There are 11 different books and 17 different movies in the ' crazy silly school ' series. If you read 7 of the books and watched 21 of the movies 

 Question: How many more movies than books have you read?
answer:
14


question:
Context: Kelly has 20 nintendo games and 70 sony games. 

 Question: How many nintendo games does she need to give away so that she will have 12 nintendo games left?
answer:

8