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In a survey of465people, a pet food manufacturer found that139owned a dog but not a cat,78owned a cat but not a dog, and137owned neither a

  1. In a survey of465people, a pet food manufacturer found that139owned a dog but not a cat,78owned a cat but not a dog, and137owned neither a dog or a cat.

(a) How many owned both a cat and a dog?

(b) How many owned a dog?

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