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At my office, 16 people own cats, 11 people own dogs, and 7 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".)

 Aug 14, 2021
 #1
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There are 18 people who own a cat or a dog.

 Aug 14, 2021
 #2
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At my office, 16 people own cats, 11 people own dogs, and 7 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".)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

There are 20 people who own cats and dogs. 

 

(16 - 7) + (11 - 7) = 13

 

Soo, only 13 people own a cat or a dog. 

 

7 people own both cats and dogs.

 Aug 14, 2021

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