how many liters of water must be added to 18 liters of milk and water containing 10 % water to make it 70 % water ?
"by rule of alligation : 70 % - 10 % = 60 % 100 % - 70 % = 30 % quantity of pure water : quantity of the mixture = 6 : 3 there are 18 liters of mixture , so we need to add 36 liters of pure water . the answer is c ."
multiply(divide(18, 10), divide(70, 10))