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.

A waiter had 9 tables he was waiting on , with 7 women and 3 men at each table . How many customers total did the waiter have ?
90

Lena drove 204 miles . Using 10 gallons of gas at this rate , how many gallons of gas would she need to drive 255 miles ?
12.5

Ned had 15 video games but 6 of them were n't working . If he wanted to sell the working games for $ 7 each , how much money could he earn ?

63