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: Paul got a box of 267 crayons for his birthday. During the school year he lost 231 crayons while he gave away 308 crayons to his friends.

Question: How many more crayons did he give to his friends than those he lost?
77

Context: During summer break 61619 kids from Lawrence county stayed home and the rest went to camp. The total number of kids in Lawrence county is 91676.

Question: About how many kids in Lawrence county went to camp?
30057

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