Task: Question Answering
Input (English): Question: In a mixture 60 litres, the ratio of milk and water 2 : 1. If this ratio is to be 1 : 2, then the quanity of water to be further added is:

 Option A: 20 litres

 Option B: 30 litres

 Option C: 40 litres

 Option D: 60 litres

 Option E: none
Output (English): Option D