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

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

[EX Q]: Ruby has 63 apples . Emily takes 55 away . How many apples will Ruby have ?
[EX A]: 8

[EX Q]: Lewis saved checking on the grapevines for his last stop . He was told by one of the pickers that they fill 324 drums of grapes per day . How many drums of grapes would be filled in 9 days ?
[EX A]:
2916