You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Luke made 9 dollars mowing lawns and 18 dollars weed eating . If he only spent 3 dollar a week , how long would the money last him ?
[EX A]: 9

[EX Q]: Sean has 223 whistles . Sean has 95 more whistles than Charles . How many whistles does Charles have ?
[EX A]: 128

[EX Q]: Sam found 35 seashells on the beach , he gave Joan 18 of the seashells . How many seashells does he now have ?
[EX A]:
17