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Mathematics 15 Online
OpenStudy (anonymous):

A survey of 300 families revealed the following information. 115 had a dog 88 had a cat 40 had a dog and a cat 112 had neither a cat nor a dog nor a parakeet 10 had a cat, a dog, and a parakeet If none of these families had any pet other than a dog, cat, or parakeet, how many had a parakeet only?

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