A container contains 40 litre of milk From this container 4 litre of milk was taken out and replaced...........

Quantitative Aptitude ( CCS) Mixture and Alligation

A container contains 40 litre of milk. From this container 4 litre of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now remains in the container?

26.34 litre

27.36 litre

28 litre

29.16 litre

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Explanation:

If you are taking out 4 liters out of a 40 liter solution and replacing it with water, you are effectively replacing 1/10th of the solution with water.
=> Fraction of milk will become (9/10) of the original
If the process is repeated 'n' times, fraction of milk will become (9/10)^n of the original.
We are given the process was done thrice
=> Final quantity of milk = (9/10)^3 * 40 = 0.729*40 = 29.16