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23 July, 05:50

M varies jointly as q and r. One set of values is m = 86.4, q = 9, and r = 12. Find m when q = 20 and r = 6.5.

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  1. 23 July, 09:08
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    M=kqr

    k=constant of propoertionality

    86.4=k (9) (12)

    86.4=108k

    divide both sides by 108

    86.4/108=k

    M = (86.4/108) qr

    q=20

    r=6.5

    M = (86.4/108) (20) (6.5)

    M=104
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