Milk contains 5% water. What content of pure milk should be added to 10 liters of milk to reduce this to 2%?
Choose the correct choice from the following answers:
A) 10liters  B) 15liters  C) 20liters  D) 18liters  E) 22liters
Quantity of water in 10 liters = 5% of 10 liters = 0.5 liters   Let x liters of pure milk be added.   Then, 0.5/(10+x) = 2/100   2x = 30   x=15 liters   Answer is 15liters
<result>B</result>
Milk contains 5% water. What content of pure milk should be added to 10 liters of milk to reduce this to 2%?