An alloy of gold and silver weights 50g. It contains 80% gold. How much gold should be added to the alloy, so that percentage of gold is increased to 90 ?

An alloy of gold and silver weights 50g. It contains 80% gold. How muc

1.	An alloy of gold and silver weights 50g. It contains 80% gold. How much gold should be added to the alloy, so that percentage of gold is increased to 90 ?
A.	50g
B.	60g
C.	30g
D.	40g
E.	None of the above
Answer» B. 60g

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An alloy of gold and silver weights 50g. 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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