averages

the avg of 8 men is increased by 2 years when one of them whose age is 24 is replaced by freshman what is his age?
let avg =x.
so sum is 8x
sum replaced 8(x+2)-24+y

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  1. 8(x+2) = 8x-24+y
    8x+16 = 8x-24+y
    40 = y

    It doesn't matter what the average age is. Replacing a 24-year-old by a 40-year-old adds 16 years to the total ages, raising the average by 2.

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    posted by Steve

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