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      Question

      What is the value of ‘x’ if x% of 720 added to {2160

      ÷ x of 20} × 2 gives 180?
      A 25 Correct Answer Incorrect Answer
      B 12 Correct Answer Incorrect Answer
      C 10 Correct Answer Incorrect Answer
      D 5 Correct Answer Incorrect Answer

      Solution

      ATQ,

      x% of 720 + {2160 ÷ x of 20} × 2 = 180

      Or, 7.2x + 432/x = 180

      Or, Multiply both sides by 10:

      72x + 4320/x = 1800

      Or, x² – 25x + 60 = 0

      Or, x² – 20x – 5x + 100 = 0

      Or, x(x – 20) – 5(x – 20) = 0

      Or, (x – 5)(x – 20) = 0

      Or, x = 5 or x = 20

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