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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?

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Solution

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Inital amount of gold = $\frac{8}{1 0} \times 50$ $=$ $40$ gm
Let amount of gold required to me mixed = $X$ gm
According to question , $40 + x = \frac{9}{1 0} \times$ ( $50 + x$ )
Solving we get $x = 50$ gm

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