A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container? Choose the correct option.
A) 26 litres B) 29.16 litres C) 28 litres D) 28.2 litres E) 30 litres
Explanation:   Suppose a container contains xx units of a liquid from which yy units are taken out and replaced by water. After nn operations, quantity of pure liquid =x(1âˆ’yx)n units   milk contained by the container now   =40(1âˆ’440)3=40(1âˆ’110)3=40Ã—9/10Ã—9/10Ã—9/10   =4Ã—9Ã—9Ã—9 / 100   =29.16   ANSWER IS 29.16 litres
<result>B</result>
A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container?