In a survey of 128 pet owners, 24 said they own a dog, and 71 said they own a cat. 6 said they own both a dog and a cat? How many owned a dog but not a cat?

Question

In a survey of 128 pet owners, 24 said they own a dog, and 71 said they own a cat. 6 said they own both a dog and a cat? How many owned a dog but not a cat?

Answer 1

24-6 = 18 owned a dog but not a cat

24 owned a dog. but 6 owned both a cat & dog, so subtract 6 from 24 to get 18 as sole owners of dogs