Question

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

21, 24, 18, 15, 15
A person enters the room.
The mean age of the 6 people is now 16.
What is the age of the person who entered the room?

Answer 1

3 years old

Explanation:

x= age of the person who entered the room

The sum of 21,+ 24,+ 18,+ 15,+ 15 = 93

(93+x ) divided into 6 = 16

Multiply both sides by 6

93+x = 96

x=3

93+3= 96

96/6 = 16

Answer 2

3 years old

Explanation:

( 21 + 24 + 18 + 15 + 15 + x ) / 6 = 16

93 + x = 96

x = 3

The person who entered the room is 3 years old.