Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

[Q]: even the chipmunks are trying to get away to find other warmer places to stay . if 21 chipmunk families were left from the original 86 families how many chipmunk families went away ?
[A]: 65

[Q]: finally they had to roam around 169 factories to make sure they are throwing their wastes properly . if their group went to 69 factories and the second went to 52 how many factories remain unchecked ?
[A]: 48

[Q]: cindy and dan have the same number of stickers . cindy used 15 of her stickers . dan bought 18 more stickers . how many more stickers did dan have than cindy then ?
[A]:
33