You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Our class got 54 books from the library . Then we got 23 more books from the library . How many books did our class get from the library ?
[EX A]: 77

[EX Q]: For the school bake sale Carol made 30 cupcakes . If she sold 9 of them and then made 28 more , how many cupcakes would she have ?
[EX A]: 49

[EX Q]: Keith spent $ 6.51 on a rabbit toy , $ 5.79 on pet food , and a cage cost him $ 12.51 . He found a dollar bill on the ground . What was the total cost of Keith 's purchases ?
[EX A]:
24.81