Question

A survey of 260 families showed that

99 had a dog;
76 had a cat;
34 had a dog and a cat;
98 had neither a cat nor a dog nor a parakeet;
8 had a cat and a dog and a parakeet.

How many had a parakeet only?

Answer 1

Note that "99 had a dog" and "34 had a dog and a cat" etc does not indicate that those families had only that kind of pet, so it's likely that some families are counted twice here.

Adding up what is known gives us 239, so there were 260 - 239 = 21 families that had a parakeet only.

Answer 2

awesome thanks a lot!!

Answer 3

My Pleasure.

Answer 4

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