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      Question

      If 20% of a number is added to 120, then the result is

      the same number. 80% of the same number is: 
      A 240 Correct Answer Incorrect Answer
      B 120 Correct Answer Incorrect Answer
      C 140 Correct Answer Incorrect Answer
      D 180 Correct Answer Incorrect Answer

      Solution

      Let the number be x 20% of x = 0.2x ATQ: 0.2x + 120 = x x − 0.2x = 120 0.8x = 120 x = 120 / 0.8 = 150 80% of x = 0.8 × 150 = 120

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