A drum has 40 kg of water from this drum 4kg of water was taken out and replaced by spirit This task...........

Quantitative Aptitude ( CCS) Mixture and Alligation

A drum has 40 kg of water, from this drum 4kg of water was taken out and replaced by spirit. This task was repeated nearly 2 times. How much water is now contained by the drum?

29.16kg

31.5kg

25kg

26.35kg

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Explanation:

Some of water in the Drum a is 40 kg
Some of water taken out b is 4 kg
No.of times = 3
Some of water in the Drum is { a[ 1 – (b/a) ]n }kg
={ 40[ 1 – (4/40) ]3 }kg
= 40 (9/10)3 kg
= 40 ( 729/1000)
Some of water in the Drum = 29.16 kg