math

Hannah is (3/7) as heavy as Irna and (3/4) as heavy as Jiahui. What is the ratio of Hannah's mass to the total mass of the 3 girls?

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  1. taking the ratios in reverse,
    I/H = 7/3
    J/H = 4/3
    (I+J)/H = 11/3
    I+J = 11/3 H
    I+J+H = 14/3 H
    so, H/(I+J+H) = 3/14

    the simplest case is that Hannah weighs 3, Irna weighs 7, Jiahui weighs 4
    The desired ratio is thus 3/(3+7+4) = 3/14

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