New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    If x+3, x-2, 6 and 5 are in proportion then find the

    mean proportional to x and 9x2.
    A 67 Correct Answer Incorrect Answer
    B 55 Correct Answer Incorrect Answer
    C 81 Correct Answer Incorrect Answer
    D 35 Correct Answer Incorrect Answer

    Solution

    => (x + 3)/(x – 2) = 6/5 => 5x + 15 = 6x – 12 => x = 27 Mean proportional to x and 9x = √(x×9x) = 3x = 3×27 = 81

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