The mean age of 5 people in a room is 28 years. A person enters the room. The mean age is now 32. W

Discussion in 'Calculator Requests' started by math_celebrity, Nov 5, 2019.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    The mean age of 5 people in a room is 28 years. A person enters the room. The mean age is now 32. What is the age of the person who entered the room?

    The sum of the 5 people's scores is S. We know:
    S/5 = 28

    Cross multiply:
    S = 140

    We're told that:
    (140 + a)/6 = 32

    Cross multiply:
    140 + a = 192

    Type this equation into our search engine, we get:
    a = 52
     

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