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      Question

      A factory has a mixture containing 60% iron and 40%

      copper. If 20 kg of copper is added, resulting in a mixture that is 50% iron, what was the initial weight of the mixture?
      A 80 kg Correct Answer Incorrect Answer
      B 85 kg Correct Answer Incorrect Answer
      C 90 kg Correct Answer Incorrect Answer
      D 100 kg Correct Answer Incorrect Answer
      E 110 kg Correct Answer Incorrect Answer

      Solution

      Iron = 6x kg Copper = 4x kg When 20 kg of copper is added then, 2x = 20 x = 10 initial weight of the mixture = 10x = 100 kg

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