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Question

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?

Solution
Verified by Toppr

Inital amount of gold = 810×50 = 40gm
Let amount of gold required to me mixed = X gm
According to question ,40+x=910× (50+x)
Solving we get x=50gm

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