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.

[Q]: The cost of 5 feet of chain is 2 dollars , what length of chain can be purchased with 7.5 dollars ?
[A]: 18.75

[Q]: Sally saw 1 dozen birds in a tree . How many birds did Sally see ?
[A]: 12

[Q]: Kaleb had 34 books . If he sold 17 of them and used the money he earned to buy 7 new books , how many books would Kaleb have ?
[A]:
24