SOLUTION: 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?

Question 1061868: 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?
Found 2 solutions by addingup, ikleyn:
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
68 pet owners
20 own a dog
21 own a cat
18 own both, a dog and a cat
-.-.-.-.-.-.-.-.-.
From this information, we have how many cats?:
21 cats from people who own only a cat
18 cats from people that own a cat and a dog
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39 is the total of cats
Answer by ikleyn(52786) (Show Source): You can put this solution on YOUR website!
.
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.

Answer. 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".

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