Question

A class of 20 music student say they play instruments 8 play guitar and 9 play piano how many people play both

Answer 1

The correct answer is 3 music students plays both the piano and guitar.

Explanation:

20-8-9=3

Total Music Students - Guitar Students - Piano Students = The amount of Student who play both

Answer 2

I am just guessing but if 17 play either guitar or piano then 3 play both !!!