Answer: Option B
This is the question of removal and replacement
If a vessel contains “x” litres of liquid A and if “y” litres be withdrawn and replaced by liquid B, then if “y” litres of the mixture be withdrawn and replaced by liquid B again, and the operation is repeated ‘n’ times in all, then:
So, in the given question, we have A as wine and B as water and 2 operations have occurred.
Therefore, quantity of wine after 2 operations
= 81 litre
Thus, in a mixture of 100 ltr, 81 is wine, so water will be 100 – 81 = 19 ltr
Required ratio of wine and water is 81 : 19