The following are the ages (years) of 5 people in a room:
23, 18, 15, 16, 13
A person enters the room.
The mean age of the 6 people is now 18.
What is the age of the person who entered the room?
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Answer:
23
Step-by-step explanation:
- first you find out the total ages of 6 people.
18 × 6 = 108
- add up the ages of the 5 people
23 + 18 + 15 + 16 + 13 = 85
- next you subtract the total ages of 6 people and 5 people and the result is the age of the 6th person.
108 - 85 = 23.
hence the 6th person age is 23.
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