In a mixture of 100 litres of milk and water, the ratio of milk and water is 3 : 2. If this ratio is to be 1 : 1, how much more water is to be added to the mixture?

25 litres 15 litres 30 litres 20 litres

20 litres

M : W   3  : 2 ⇒ Quantity of solution = 100 Liters ⇒ (3 + 2)x = 100 ⇒ 5x = 100 ⇒ x = 20 Liters, Amount of water to be added to make ratio 1 : 1, ⇒ 3 X 20 : 2 x 20 = 60 L : 40 L ⇒ 60 = 40 + x ⇒ x = 20 Liters.