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27 February, 04:05

8/f = 56/105 what is f?

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  1. 27 February, 07:07
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    8/15 = 56/105

    This may be solved using proportion.

    a/b = c/d

    ad = bc where cross products are equal.

    a = 8

    b = f

    c = 56

    d = 105

    ad = bc

    8*105 = f*56

    840 = 56f

    840/56 = 56f/56

    f = 15

    56 : 7 = 8

    105 : 7 = 15
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