A milkman mixes 20 L of water with 80 L of milk. After selling one-fourth of this mixture

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

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

Answer 

Initially, water = 20 L and milk = 80 L

Total Mixture = 100 L

Ratio of water : milk = 1 : 4

One-fourth of the mixture = 1/4 x 100 = 25

After selling one-fourth of the mixture,

Remaining mixture = 100 - 25 = 75 L

In the remaining mixture, water = 1/5 x 75 = 15 L and milk = 4/5 x 75 = 60 L

To replenish 25 L quantity, more water is added.

Total water = 15 + 25 = 40 L

So, new ratio = 40 : 60 or 2: 3

The correct option is A.