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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%?

Correct Answer: 50 gm

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


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


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