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.

[Q]: 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?
[A]: 21


[Q]: Context: Jack received a total of 9 emails in the day. If he received 7 emails in the morning and some more in the afternoon 

 Question: How many emails did Jack receive in the afternoon?
[A]: 2


[Q]: Context: Mary is baking a cake. The recipe calls for 3 cups of sugar and 10 cups of flour. She already put in some cups of flour. If she still needs 5 more cups of flour than sugar 

 Question: How many cups of flour did she put in?
[A]:
2