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12 June, 21:09

Y varies jointly with w and z inversely with x. If y=36, when x=14, w=7 and z=8. Then what is y when x=20, w=16, and z=10?

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  1. 12 June, 21:32
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    Y = kwz / x

    36 = k*7*8 / 14 = 56k/14 = 4k

    k = 36 / 4 = 9

    so equation is y = 9wz/x

    when x=20, w=16 and z=10:-

    y = 9 * 16*10 / 20 = 72
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