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.

[Q]: at lunch a waiter had 10 customers and 5 of them did n't leave a tip . if he got $ 3 each from the 1 who did tip how much money did he earn ?
[A]: 15


[Q]: edward 's dad bought 459 centimeters of string . if he cut the string into 9 equal pieces what would be the length of each piece ?
[A]: 51


[Q]: lexie has a lot of art materials . she needs to organize all these materials into containers . she counted her crayons and found out that she has 80 crayons which she will place in crayon boxes . every crayon box can contain 8 crayons . how many crayon boxes does she need ?
[A]:
10