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: A waiter had 13 customers. After some left he got 4 new customers. If he still had 9 customers

Question: How many customers left?
[EX A]: 8

[EX Q]: Context: Dave had 24 files and 13 apps on his phone. After deleting some apps and files he had 17 apps and 21 files left.

Question: How many files did he delete?
[EX A]: 3

[EX Q]: Context: Jackie has 10 apples. Adam has 8 apples.

Question: How many more apples does Jackie have than Adam?
[EX A]:
2