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]: there were 150 book shelves . each book shelf had 15 books . how many books were on the shelves ?
[A]: 2250

[Q]: sarah is making bead necklaces . she has 945 beads and is making 7 necklaces with each necklace using the same number of beads . how many beads will each necklace use ?
[A]: 135

[Q]: haley 's mom was buying extra school supplies for haley and her sister . if she bought 2 reams of paper for haley and 3 reams for her sister how many did she buy total ?
[A]:
5