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S.A.T Math

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At Central Park Zoo,the ratio of sea lions to penguins is 4 to 11. If there are 84 more penguins than sea lions, how many sea lions are there?

The answer book says: C is the answer. The correct answer should yield a ratio of sea lions to Penguins of 4 to 11, so try out choice C. If there are 48 sea lions, there are 48+84=132 penguins, so the ratio of sea lions to penguins is 48/132=4/11, which is just what we want.

How did they know to pick choice C??

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