The Probability of Books!

Team: 
Pierce 7A
Topic: Probability, Counting & Combinatorics
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PLEASE VOTE FOR US!!! Zoe's books are unorganized :( so Margie is going to attempt to help her organize the. Their method is to calculate the probability of literature and math books there are.

Common Core Standards: 7.SP.5
Problem #: 
8 (2011-2012)
Problem Difficulty Level: 3 [?]