At my office, 16 people own cats, 9 people own dogs, and 5 people own both cats and dogs. How many people own a cat or a dog?

(Remember that in mathematics, the word "or" is used in the inclusive sense. So if you own both a cat and a dog, then you are included in the category of people "who own a cat or a dog".)

 Dec 4, 2021

Hello Guest,

Here is my attempt:

There are 16 people who own cats, and 5 people who own cats and dogs, so there are 11 people who only own cats. Now there are 9 people who own dogs or both, so the answer would be \(11 + 9 = \boxed{20}\) people own a cat or a dog

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