Question

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

13, 22, 13, 18, 14
A person enters the room.
The mean age of the 6 people is now 23.
What is the age of the person who entered the room?

Answer 1

58

Explanation:

the mean is adding up all the numbers, then dividing by the amount of the numbers.

add up all the numbers:

13 + 13 + 14 + 18 + 22 = 80

the mean is 23.

so you need to back track:

23 * 6 = 138

138 - 80 = 58