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 two more times. How much milk is now left in the container ?
Answer & explanation
Correct answer: option 3
The correct answer is option (3) : 29.16 litre
Given $x= 40\, litre $
$y = 4\, litre $
$n= 3$
So, amount of milk left $= x(1-\frac{y}{x})^n$
$= 40(1-\frac{4}{40})^3$
$=40×(\frac{9}{10})^3$
$= 29.16\, litre $