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.

Context: Baker made 7 cakes and 148 pastries. If he sold 15 cakes and 103 pastries 

 Question: How many pastries would baker still have?
45

Context: Jerry had 5 action figures and 2 books on a shelf in his room. Later he added 9 more books to the shelf. 

 Question: How many more books than action figures were on his shelf?
6

Context: Zachary did 51 push-ups and David did 44 push-ups in gym class today. 

 Question: How many more push-ups did Zachary do than David?

7