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6 July, 22:52

The mean weight of females in a class is 60kg and that of the males is 72kg. If the mean

weight of the class is 68kg, what is the ratio of females to males in the class?

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  1. 7 July, 01:02
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    1:2

    Step-by-step explanation:

    Let's say there are x males and y females in the class.

    The sum of all male weights will be 72x, and the sum of all female weights will be 60y.

    If we get a class mean weight, we have:

    (72x + 60y) / (x+y) = 68

    72x + 60y = 68x + 68y

    4x = 8y

    y / x = 4/8 = 1/2

    So the ratio of females to males is the class is 1:2
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