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: A grocery store had 81 bottles of regular soda, 60 bottles of diet soda and 60 bottles of lite soda. 

 Question: How many more bottles of regular soda did they have than diet soda?
answer:
21


question:
Context: Bobby had 21 pieces of candy. He ate 5 pieces of candy. Then he ate 9 more. 

 Question: How many pieces of candy does he still have left?
answer:
7


question:
Context: Katie had 81 ds games and her friends had 59 games. 

 Question: How many more games does Katie have than her friends?
answer:

22