Mathematics, 08.12.2020 01:00, clairajogriggsk

The mean age of 5 people in a room is 31 years. A person enters the room. The mean age is now 30. What is the age of the person who entered the room?

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The mean age of 5 people in a room is 31 years. A person enters the room. The mean age is now 30. Wh...

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