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6 April, 23:38

At the bank of a river, by measurement, a = 9 ft., b = 15 ft., c = 12 ft., and d = 7 ft. How long is x?

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  1. 7 April, 01:43
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    Answer: x is 20

    Step-by-step explanation:

    This is ratio

    a : c = b : x and d : unknown

    a : c = 9 : 12 = 3 : 4 which is 9/12

    b : x = 15 : x which is 15 / x

    So the proportion will be:

    3/4 = 15/x

    So Cross multiplying

    3x = 90

    Divide both side by 3

    x = 90/3

    x = 20
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