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40 litres of a mixture of milk and water contains 10% of water, the water to be added, to make the water content 20% in the new mixture is :
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- 6 litres
- 6.5 litres
- 5.5 litres
- 5 litres
Correct Option: D
Water content in 40 litres of mixture
| = 4 × | = 4 litres | 100 |
∴ Milk content = 40 – 4 = 36 litres
Let m litres of water is mixed.
| Then, | = | |||
| 40 + m | 100 |
| ⇒ | = | |||
| 40 + m | 5 |
⇒ 20 + 5m = 40 + m
⇒ 4m = 20 ⇒ m = 5 litres
