Answer to Question #96241 in English for Cherry Bilucora

Question

We asked 7 of Louis friends:
How many of you have dogs at home?
5 raised their hand.
How many of you only have cats at home?
2 raised their hand.
How many of you have dogs and cats?
2 raised their hand
According to the survey, would you able to tell me how many only have dogs at home?

Answer 1

If 5 friends of 7 have dogs at home, and 2 friends of these 5 have both dogs and cats (because other 2 friends only have cats), then 5 - 2 = 3 friends only have dogs at home.