Multiple Choice Questions on In two alloys copper and zinc are in the ratio of 1 4 and 3 1 respectively 20 kg of first alloy and ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

In two alloys copper and zinc are in the ratio of 1 4 and 3 1 respectively 20 kg of first alloy and ...........

Quant (SSC) Mixture and Alligation
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    In two alloys copper and zinc are in the ratio of 1:4 and 3:1 respectively. 20 kg of first alloy and 32 kg of second alloy and some pure zinc are melted together. An alloy is obtained in which the ratio of copper and zinc was 3:5. Find the quantity of zinc melted.

    65/3 kg

    Incorrect Answer

    67/3 kg

    Incorrect Answer

    68/3 kg

    Correct Answer

    71/3 kg

    Incorrect Answer
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    Explanation:

    Copper = 1/5*20 + 3/4*32 = 28kg
    zinc = 4/5*20 + 1/4*32 = 24kg
    now x kg of zinc is added,
    so [28/24 + x] = 3/5.
    X = 68/3 kg

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