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]: While shopping for music online , Megan bought 2 country albums and 8 pop albums . Each album came with a lyric sheet and had 7 songs . How many songs did Megan buy total ?
[EX A]: 70

[EX Q]: A toy store had 17 giant stuffed bears in stock when they got another shipment with 10 bears in it . The put the bears onto shelves with 9 on each shelf . How many shelves did they use ?
[EX A]: 3

[EX Q]: At lunch a waiter had 7 customers and 5 of them did n't leave a tip . If he got $ 3 each from the ones who did tip , how much money did he earn ?
[EX A]:
6