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.

billy bought 5 boxes of books at a yard sale . if each box had 7 books how many books did he buy ?
35

annie also planned the time she would spend going around the 9 blocks in her village . if she plans on spending just 8 minutes on each block how much time would it take for her to finish trick or treating ?
72

for the roof john would need 2 sets of metal bars for support . if each set has 7 metal bars how many metal bars are there in all ?

14