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.

dave had 10 video games but 2 of them were n't working . if he wanted to sell the working games for $ 4 each how much money could he earn ?
32

if 1 pack costs 11 dollars how many packs of dvd 's can you buy with 110 dollars ?
10

jerry is helping to put away books . if he has 12 books to put away and each shelf can hold 4 books how many shelves will he need ?

3