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6 September, 20:28

P varies directly as q and inversely as y. One set of values is P = 0.064, q = 16 and y = 5. Find P when q = 12 and y = 10.

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  1. 6 September, 23:06
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    Y varies inversely as x means y=kx

    y varies directly as x means y=k/x

    p varies directly as q and inversely as y

    p = (qk) / y

    0.064 = (16k) / 5

    find k

    times both sides by 5

    0.32=16k

    divide both sides by 16

    0.02=k

    p = (0.02q) / y

    q=12

    y=10

    p = (0.02*12) / 10

    p = (0.24) / 10

    p=0.024
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