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Mathematics, 31.03.2021 14:00 GladToBeACarmine

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...

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