2005 CEMC Gauss (Grade 7) Problems/Problem 6: Difference between revisions
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* [[2005 CEMC Gauss (Grade 7) Problems/Problem | * [[2005 CEMC Gauss (Grade 7) Problems/Problem 7]] | ||
Revision as of 15:06, 22 October 2014
Problem
At a class party, each student randomly selects a wrapped prize from a bag. The prizes include books and calculators. There are 
prizes in the bag. Meghan is the first to choose a prize. If the probability of Meghan choosing a book for her prize is 
, how many books are in the bag?
Solution
Since Meghan chooses a prize from in the bag and the probability of her choosing a book is , then of the prizes in the bag must be books. Therefore, the number of books in the bag is 
. The answer is 
.
