Question

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The mean age of 5 people in a room is 27 years.
A person enters the room.
The mean age is now 35.
What is the age of the person who entered the room?

Answer 1

• 75 years old

Explanation:

The mean of 5 numbers is 27.

The sum of five is:

• 5*27 = 135

Now there are 6 people with the mean age of 35 years.

The sum of six is:

• 6*35 = 210

The difference of the sums is the age of the person entered the room:

• 210 - 135 = 75