In a mixture of 60 litres, the ratio of milk and water is

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In a mixture of 60 litres, the ratio of milk and water is 2 : 1. What amount of water must be added to make the ratio 1 : 2 ?

1. 42 litres
2. 56 litres
3. 60 litres
4. 77 litres

Correct Option: C

Milk = 60 x (2/3) litres =40 litres
Water = (60 - 40) litres = 20 litres
∵ 40 / (20 + x) = 1/2
⇒ 20 + x = 80
∴ x = 60
Hence water to be added = 60 litres.