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%?
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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By: Amit Kumar