Question

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

20, 15, 25, 17, 20
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

9514 1404 393

Answer:

41

Explanation:

The mean age is the sum divided by the number of contributors. The mean is 23 and the number of contributors is 6, so the sum is 6×23 = 138. The missing age is ...

138 -20 -15 -25 -17 -20 = 41

The person who entered the room is 41 years old.