There are 29 students in class. 20 have dogs and 14 have cats. How many have both

Question

There are 29 students

in class. 20 have dogs and 14 have cats. How many have both?

Answer 1

You could use a Venn diagram - I can draw one here.

Or reason: 20 + 14 = 34, there there are only 29 students, so 34 - 29 or 5 have both a dog and a cat

 

15 have only a dog

5 have a dog and a cat

9 have only a cat