Question 1061868
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In a survey of 68 pet owners, 20 said they own a dog, and 21 said they own a cat. 18 said they own both a dog and a cat. 
How many owned a cat but not a dog?
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How many owned a cat but not a dog? 21 - 18 = 3.


<U>Answer</U>. 3 pet owners owned a cat but not a dog.



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P.S. I don't know to which question answered the tutor "addingup".