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      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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