The Correct answer is C.
Explanation
To solve this problem, you must realize that some of the also own cats and some of the
cat owners also own dogs. This has to be true because
is more than
! The question asks how many of the dog owners do not own cats. To solve the problem, first find the number of people who own both a dog and a cat. To do this, let
equal the number who own both a dog and a cat. Then
. (Note: Adding
and
counts
twice, so
must be subtracted from the sum to get
.) Next, the equation
can be solved for
, yielding
. Finally, the number of dog owners who own no cat is
.
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