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

[EX Q]: there are 43 dogs 72 fish and 34 cats at my farm . how many pets do i have at my farm ?
[EX A]: 149

[EX Q]: paul made 44 dollars mowing lawns and 28 dollars weed eating . if he only spent 9 dollar a week how long would the money last him ?
[EX A]: 8

[EX Q]: a mirror store has 78 mirrors in stock . 8 mirrors are broken and 57 mirrors are sold . how many mirrors are left ?
[EX A]:
13