Question

The following are the ages (years) of 5 people in a room:

14
,


24
,


24
,


20
,


24


A person enters the room.
The mean age of the 6 people is now 21.
What is the age of the person who entered the room?

Answer 1

20

Explanation:

`(14 + 20 + 24 + 24 + 24 + x) / 6 = 21 \\ 106 + x = 126 \\ x = 126 - 106 = 20`