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    Question

    In an alloy of three metals, ratio of the quantity of

    gold, silver and platinum is 5:7:8, respectively. If total quantity of silver and platinum together is 150 kg then find the difference between the quantity of silver and gold.
    A 21 kg Correct Answer Incorrect Answer
    B 10 kg Correct Answer Incorrect Answer
    C 20 kg Correct Answer Incorrect Answer
    D 18 kg Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the quantity of gold, silver and platinum be ‘5x’ kg, ‘7x’ kg and ‘8x’ kg, respectively. Total quantity of silver and platinum together = 150 kg 7x + 8x = 150 Or, x = 10 Difference between the quantity of silver and gold = {(7 – 5) × 10} = 20 kg

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