Subject: mathqa
Question: a 100 - litre mixture of milk and water contains 30.25 litres of milk . ' x ' litres of this mixture is removed and replaced with an equal quantum of water . if the process is repeated once , then the concentration of the milk stands reduced at 25 % . what is the value of x ?
Option: 
A: 6 litres
B: 9.1 litres
C: 12 litres
D: 10 litres
Answer: B