Quantitative Aptitude :: Pipes & Cistern - Discussion

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Explanation:
Lets Assume capacity of bucket A = x
so capacity of bucket B = x/3

Given that it takes 80 turns for bucket A to fill the empty drum.
So capacity of the drum = 80x

Number of turns required if both A and B having each turn together=80x/(x+x/3)=240x/(3x+x)=60