At a class party, each student randomly selects a wrapped prize from a bag. The prizes include books and calculators. There are 27 prizes in the bag. Meghan is the first to choose a prize. If the probability of Meghan choosing a book for her prize is 32, how many books are in the bag?
(A) 15 (B) 9 (C) 21 (D) 7 (E) 18
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Source: CEMC, University of Waterloo,
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