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An alloy of gold and silver weighs 50...

An alloy of gold and silver weighs 50 g. It contains 80% gold. How much gold should be added to the alloy so that percentage of gold is increased to 90? `30\ g` b. `40` g c. `50\ g` d. `60\ `

A

50 g

B

60 g

C

30 g

D

40 g

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The correct Answer is:
A
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