Multiple Choice Questions on An alloy of gold and copper weights 50 g It contains 80 gold How much gold should be added to the al........... for Uttarakhand Civil Services (UKPCS) Preparation

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Multiple Choice Questions

An alloy of gold and copper weights 50 g It contains 80 gold How much gold should be added to the al...........

Quantitative Aptitude Mixture and Alligation
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    An alloy of gold and copper weights 50 g. It contains 80% gold. How much gold should be added to the alloy so that percentage of gold is increased to 90?

    50gm

    Correct Answer

    60gm

    Incorrect Answer

    45gm

    Incorrect Answer

    35gm

    Incorrect Answer
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    Explanation:

    Solution: 
    Gold in alloy =50*80% =40gm
    Copper in alloy =50*20%=10gm
    Now,
    (40+x)/10=90/10
    X=50gm

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