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]: A new building needed 10 windows . The builder had already installed 6 of them . If it takes 5 hours to install each window , how long will it take him to install the rest ?
[EX A]: 20

[EX Q]: Will bought 7 boxes of chocolate candy and gave 3 to his little brother . If each box has 4 pieces inside it , how many pieces did Will still have ?
[EX A]: 16

[EX Q]: Mike had 16 video games but 8 of them were n't working . If he wanted to sell the working games for $ 7 each , how much money could he earn ?
[EX A]:
56