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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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