A container has 30 L of water If 3 L of water is replaced by 3 L of spirit and this operation is rep...........

Quantitative Aptitude ( CCS) Mixture and Alligation

A container has 30 L of water. If 3 L of water is replaced by 3 L of spirit and this operation is repeated twice , what will be the quantity of water in the new mixture?

27.1 L

25.5 L

14.4 L

24.3 L

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Explanation:

Solution:
Suppose a container contains x units of liquid from which y units are taken out and replaced by water. After n operations, the quantity of pure liquid.
= x(1 – y/x)ⁿ units
= Remaining water = 30(1 – 3/30)² = 24.3 L