The mean age of 5 people in a room is 28 years.

A person enters the room.

The mean age is now 32.

What is the age of the person who entered the room?

52 years

Step-by-step explanation:

Since the mean age of 5 people in that room is 28 years,

∴ Sum₍₅₎ = (28*5) years

= 140 years

Then, one person enters the room which makes the mean age 32 years.

∴Sum₍₆₎ = (32*6) years

= 192 years

∴The age of the person who enters the room = (192 - 140) years

= 52 years