135 liters of a mixture of milk and water contains in the ratio 3:2. How much water should now be added so that the ratio of milk and water becomes 3:4? Choose the correct choice from the following choices:
A) 12 liters
B) 32 liters
C) 41 liters
D) 54 liters
E) 34 liters

Rationale: "milk = 3 / 5 * 135 = 81 liters water = 54 liters 81 : ( 54 + p ) = 3 : 4 162 + 3 p = 324 = > p = 54 54 liters of water are to be added for the ratio become 3 : 4 . answer : d"
Answer: D