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.

[EX Q]: Context: Dave had 19 apps and 18 files on his phone. After deleting some apps and files he had 6 apps and 15 files left. 

 Question: How many more files than apps does he have left on the phone?
[EX A]: 9

[EX Q]: Context: Jerry had 7 books and 3 action figures on a shelf in his room. Later he added 2 more action figures to the shelf. 

 Question: How many more books than action figures were on his shelf?
[EX A]: 2

[EX Q]: Context: Jerry had 8 action figures on a shelf in his room. Later he added 4 more action figures to the shelf and removed 5 old ones. 

 Question: How many action figures were on his shelf in all?
[EX A]:
7