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  1. What is the least number to be subtracted from 11, 15, 21 and 30 each so that the resultant numbers become proportional?
    2. A.
    1
    B.
    2
    C.
    3
    D.
    4
    E.
    None of these

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    Answer : Option C

    Explanation :

    Let the least number to be subtracted be 'x', then 11 - x, 15 - x, 21 - x and 30 - x are in proportion.
    <=> (11 - x):(15 - x) = (21 - x):(30 -x)(21 - x)
    From the options, when x = 3
    => 8 * 27 = 12 * 18 => then x = 3. => (11 - x)(30 - x) = (15 - x)(21 - x)

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