In a 45 litres mixture of milk and water, the ratio of the

In a 45 litres mixture of milk and water, the ratio of the milk to water is 2 : 1. When some quantity of water is added to the mixture, this ratio becomes 1 : 2. The quantity of water added is

Quantity of milk in 45 litres =	2	× 45 = 30 litres.
	3

∴ Water = (45 – 15)
= 15 litres
Let x litres of water be added.

∴	30	=	1
	15 + x		2

⇒ 15 + x = 60
⇒ x = 60 – 15 = 45 litres.