milk contains 10 % water . what content of pure milk should be added to 20 liters of milk to reduce this to 5 % ?
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 5 x = 100 x = 20 liters answer is a
subtract(divide(multiply(divide(10, const_100), 20), divide(5, const_100)), 20)