instruction:
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.
question:
A store had 86 coloring books in stock . They ended up putting them on sale and getting rid of 37 of them . The put the ones they still had onto shelves with 7 on each shelf . How many shelves did they use ?
answer:
7

question:
Edward and his friend were buying trick decks from the magic shop for 9 dollars each . How much did they spend if Edward bought 4 decks and his friend bought 4 decks ?
answer:
72

question:
Amy had 4 music files and 21 video files on her flash drive . If she deleted 23 of the files , how many files were still on her flash drive ?
answer:
2