Multiple Choice Questions on An alloy of copper and bronze weight 50g It contains 80 Copper How much copper should be added to th........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

An alloy of copper and bronze weight 50g It contains 80 Copper How much copper should be added to th...........

Quantitative Aptitude ( CCS) Mixture and Alligation
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    An alloy of copper and bronze weight 50g. It contains 80% Copper. How much copper should be added to the alloy so that percentage of copper is increased to 90%?

    45 gm

    Incorrect Answer

    50 gm

    Correct Answer

    55 gm

    Incorrect Answer

    60 gm

    Incorrect Answer
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    Explanation:

    Initial quantity of copper =80/100 x 50 = 40 g 

    And that of Bronze = 50 - 40 = 10 g

    Let 'p' gm of copper is added to the mixture

    = (50 + p) x 90/100 = 40 + p

    = 45 + 0.9p = 40 + p

    = p = 50 g

    50 gms of copper is added to the mixture, so that the copper is increased to 90%.

    Hence, option 2 is the correct answer.

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