The following are the ages (years) of 5 people in a room: 24, 17, 18, 16, 20 A person enters the room. The mean age of the 6 people is now 25. What is the age of the person who entered the room?

The man or woman that entered the room was 55 years of age.

Step-by-step explanation:

If we add up all the ages together, it is 95. When the other person walks in, the mean changes to 25. If you do the math, or if you count, the man or woman that enters is 55, which when added together, gives 150. divided by 6 equals 25.