You are given a math word problem and you are supposed to apply a single mathematical operator 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]: a dvd book holds 126 dvds . there are 81 dvds already in the book . how many more dvds can be put in the book ?
[A]: 45

[Q]: at the arcade billy had won 48 tickets . after buying a yoyo he had 32 tickets left . how many tickets did the yoyo cost ?
[A]: 16

[Q]: she wants to know how many children will go trick or treating in their village . if there are 6 children on each of the 9 blocks how many children will go trick or treating in annie 's village ?
[A]:
54