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in a survey of 80 pet owners, 40 said they own a dog, and 38 said they own a cat. 26 said they own both a dog and a cat. How many owned neither a cat nor a dog?

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User Heroxav
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Explanation:

See Venn diagram below:

in a survey of 80 pet owners, 40 said they own a dog, and 38 said they own a cat. 26 said-example-1
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User Moriartie
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