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Discussion :: Ratio and Proportion

  1. B is inversely proportional to the cube of A. If B=3, A=2. If B = 8/9. Find the value of A.

    2. A.
    3
    B.
    5
    C.
    6
    D.
    4

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    Answer : Option A

    Explanation :

    As per the question, B is inversely proportional to A3
    i.e., B α 1/A3
    Or, B =k/ A3
    Given that, B=3, A=2
    So, 3 = k/ 8, or k=24
    Given that, B = 8/9
    So, 8/9 = 24/A3
    A3 = (9*24)/8 = 27
    So, A = 3√ 27 = 3

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