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 a total of 30 bottles of which 28 were bottles of regular soda and the rest were bottles of diet soda. 

 Question: How many bottles of diet soda did they have?
answer:
2


question:
Context: Mary is baking a cake. The recipe calls for 9 cups of flour and 11 cups of sugar. She already put in 4 cups of flour. 

 Question: How many more cups of sugar than cups of flour does she need to add now?
answer:
6


question:
Context: Rachel had to complete 8 pages of math homework. If she had to complete 3 more pages of math homework than reading homework 

 Question: How many pages did she have to complete in all?
answer:

13