A milkman mixes 20 litres of water with 80 litres of milk. After selling one-fourth

A milkman mixes 20 litres of water with 80 litres of milk. After selling one-fourth of this mixture, he adds water to replenish the quantity that he had sold. What is the current proportion of water to milk?

  1. 3 : 4
  2. 2 : 3
  3. 1 : 3
  4. 1 : 2

Answer

Ratio of water to milk = 20/80 = 1:4

(1/4) x 100 = 25 litres.

Part sold (water) = (1/5) x 25 = 5 litres

Part sold (milk) = 20 litres

He now adds 25 litres of water to replenish the quantity.

Now, out of 100 litres of the mixture there is (15+25) litres of water = 40 litres of water.

Hence, milk is 60 litres.

water : milk = 40/60 = 2:3

The correct option is B.