Milk contains 10% water. What content of pure milk should be added to 20 liters of milk to reduce this to 5%?  Choose the correct choice from the following
A) 20liters  B) 25liters  C) 30liters  D) 15liters  E) 18liters
Quantity of water in 20 liters = 10% of 20 liters = 2 liters   Let x liters of pure milk be added.   Then, 2/(20+x) = 5/100   5x = 100   x=20 liters   20litersnswer is 20liters
<result>A</result>
Milk contains 10% water. What content of pure milk should be added to 20 liters of milk to reduce this to 5%?