How many liters of water must be added to 14 liters of milk and water containing 10% water to make it 30% water?
Select the correct option:
A) 1 liter  B) 2 liters  C) 3 liters  D) 4 liters  E) 5 liters

Rationale: by rule of alligation : 30 % - 10 % = 20 % 100 % - 30 % = 70 % quantity of pure water : quantity of the mixture = 2 : 7 there are 14 liters of mixture , so we need to add 4 liters of pure water . the answer is d .
Answer: D