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: Jerry had some action figures on a shelf in his room. Later he added 2 more action figures to the shelf and removed 7 of the old ones. If there are 10 action figures on his shelf now 

 Question: How many action figures did he have initially on the shelf?
15

Context: There were 2 roses in the vase. Jessica threw away 4 roses from the vase and cut some more new roses from her flower garden to put in the vase. There are now 23 roses in the vase. 

 Question: How many roses did she cut?
25

Context: Dave had 15 apps and 24 files on his phone. After deleting some apps and files he had 21 apps and 4 files left. 

 Question: How many more apps than files does he have left on the phone?

17