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20 March, 10:23

The mean age of 5 people in a room is 40 years. A person enters the room. The mean age is now 40. What is the age of the person who entered the room?

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  1. 20 March, 14:02
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    40

    Step-by-step explanation:

    5 people in the room have 5*40 = 200 years altogether

    a new person is X years old.

    Now 6 people have (200 + x) years altogether.

    Mean age of 6 people is (200+x) / 6. and it is also = 40.

    So,

    (200+x) / 6 = 40

    200 + x = 240

    x = 40
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