instruction:
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.
question:
alyssa has 30 books in her library . she bought several books at a yard sale over the weekend . she now has 88 books in her library . how many books did she buy at the yard sale ?
answer:
58

question:
maria had 50 sheets of paper in her desk and 41 more in her backpack . how many did she have total ?
answer:
91

question:
john threw a halloween party where 13 people showed up . if only 6 dressed up how many people did n't wear costumes ?
answer:
7