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In one litre of a mixture of alcohol and water, water is 30%. The amount of alcohol that must be added to the mixture so that the part of water in the mixture becomes 15% is :
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- 1000 ml
- 700 ml
- 300 ml
- 900 ml
Correct Option: A
In 1 litre i.e. 1000 ml of mixture,
Alcohol = 700 ml.
Water = 300 ml.
Let m ml of alcohol is mixed.
| ∴ | × 100 = 15 | 1000 + m |
⇒ 1000 + m = 2000
⇒ m = 1000 ml.
