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28 October, 09:54

If y varies directly as x, and y = 12 when x = 15, find x when y = 21.

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  1. 28 October, 12:19
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    Y=kx where k is a constant

    sub y=12, x=15

    12=15k

    k=12/15

    hence, y = (12/15) x

    sub y=21,

    (12/15) x=21

    x=21:12/15=26.25

    should be right ...
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