You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: For a birthday party Tom bought 4 regular sodas and 52 diet sodas . If his fridge would only hold 7 on each shelf , how many shelves would he fill up ?
[EX A]: 8

[EX Q]: Tim has 22 books . Mike has 20 books . How many books do they have together ?
[EX A]: 42

[EX Q]: Aaron starts with 81 erasers . He gives 34 to Doris . How many erasers does Aaron end with ?
[EX A]:
47