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.

Roger had 25 books . If he sold 21 of them and used the money he earned to buy 30 new books , how many books would Roger have ?
34

Megan baked 71 cupcakes for her school 's bake sale . If her brother , Todd , ate 43 of them how many packages could she make if she put 7 cupcake in each package ?
4

A florist had 50 roses . If she sold 15 of them and then later picked 21 more , how many roses would she have ?
56