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

[EX Q]: Sara has 9 dozen golf balls . How many golf balls does she have ?
[EX A]: 108

[EX Q]: If Benjamin strolled 14 miles at 2 miles per hour , how long was Benjamin travelling ?
[EX A]: 7

[EX Q]: Mark 's father gave him $ 85 . Mark bought 10 books , each of which cost $ 5 . How much money does Mark have left ?
[EX A]:
35