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A vessel has 500 ml of pure milk. From these vessels 50 ml of the milk is removed and 50 ml of water poured into the vessel. If this operation is repeated 2 more times, what is the percentage of milk in the vessel at the end?

A.	24.30%	B.	81%
C.	72.9%	D.	75%

Answer and Explanation

Answer:72.9%

Explanation:
We know [(a – b) / a]n = c.
Where a = 500 ml, b = 50ml, n = 3
Proportion of the milk = [(500 – 50) / 500]3
= (450/500)3
= (9/10)3
= 0.729
Percentage of milk in the vessel = 100c = 72.9%

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