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 33 customers to wait on . If 31 customers left and he got another 26 customers , how many customers would he have ?
28

Each chocolate bar in a box cost $ 3 . If a box had 9 bars total and Wendy sold all but 3 bars , how much money would she have made ?
18

For Halloween Katie and her sister combined the candy they received . Katie had 10 pieces of candy while her sister had 6 . If they ate 9 pieces the first night , how many pieces do they have left ?
7