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In 30 litres mixture of acid, the ratio of acid and water is 2 : 3 . What amount of water should be added to the mixture so that the ratio of acid and water becomes 2 : 5 ?
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- 10 litres
- 15 litres
- 18 litres
- 12 litres
Correct Option: D
In 30 litres of mixture,
| Acid = | × 30 = 12 litres | |
| 5 |
| Water = | × 100 = 18 litres | |
| 5 |
| ∴ | = | ||
| 18 + x | 5 |
⇒ 60 = 36 + 2x
⇒ 2x = 60 – 36 = 24
⇒ x = 12 litres of water.
