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A vessel has 60 litres of solution of acid and water having 80% acid. How much water be added to make it a solution in which acid forms 60% ?
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- 48 litres
- 20 litres
- 36 litres
- None of these
Correct Option: B
In 60 litres of solution,
| Water = | = 12 litres | 100 |
On adding m litres of water,
| × 100 = 40 | 60 + m |
⇒ 60 + 5m = 120 + 2m
⇒ 3m = 60
⇒ m = 20 litres
