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    Question

    An alloy of copper and tin contains 85% of copper. If 28

    kg of more tin is added to the alloy, the copper content gets reduced to 50%. Find the quantity of the new alloy.
    A 70 kg Correct Answer Incorrect Answer
    B 60 kg Correct Answer Incorrect Answer
    C 68 kg Correct Answer Incorrect Answer
    D 42 kg Correct Answer Incorrect Answer

    Solution

    Ratio of copper to tin in the alloy = 17:3 Let the quantity of copper and tin in the alloy be 17x kg and 3x kg, respectively. According to question, 17x = 3x + 28 x = 2 kg So, the quantity of new alloy = 17x + 3x + 28 = 20x + 28 ⇒ 40 + 28 = 68 kg

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