How much water should be added to 12 liters of a 20%-solution of alcohol to reduce the concentration of alcohol in the solution by 75% ?  Choose the correct choice.
A) 28 liters
B) 27 liters
C) 30 liters
D) 32 liters
E) 35 liters

Rationale: let x ltr water to be added 2 ltr alcohol to be represented as ( 20 ( 1 - 3 / 4 ( new soln . = 12 + x ) ) ) 2 = 5 % * ( 12 + x ) - - - - - - - - > x = 28 ans a
Answer: A