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An alloy of gold and silver weighs 50 gm. 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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- 45 gm
- 40 gm
- 50 gm
- None of these
Correct Option: C
In original alloy,
Gold = 40 gm
Silver = 10 gm
Let x gm of gold is added.
| ∴ | = | = | ||||
| 50 + x | 100 | 10 |
⇒ 400 + 10x = 450 + 9x
⇒ x = 50 gm.
