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      Question

      A girl was asked to determine 4/7 of a number. By

      mistake she worked out 5/7 of the number. Her answer was 84 more than what it should have been. Find the number.
      A 270 Correct Answer Incorrect Answer
      B 450 Correct Answer Incorrect Answer
      C 588 Correct Answer Incorrect Answer
      D 320 Correct Answer Incorrect Answer

      Solution

      ATQ, Let the number = x Wrong answer βˆ’ Correct answer = 84 x Γ— 5/7 βˆ’ x Γ— 4/7 = 84 (5/7 βˆ’ 4/7) x = 84 (1/7) x = 84 x = 84 Γ— 7 = 588 So, the number = 588.

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