instruction:
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.
question:
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?
answer:
3


question:
Context: Dave had 21 apps on his phone. He added 89 new apps. After deleting some he had 24 left. 

 Question: How many more apps did he add than he deleted?
answer:
3


question:
Context: Jake brought 6 balloons to the park. If Jake brought 4 more balloons than the number of balloons that Allan brought 

 Question: How many balloons did Allan bring to the park?
answer:

2