13 buckets of water fill a tank when the capacity of each bucket is 51 litres How many buckets will ...........

Quantitative Aptitude ( CCS) Pipes&cistern

13 buckets of water fill a tank when the capacity of each bucket is 51 litres. How many buckets will be needed to fill the same tank, if the capacity of each bucket is 17 litres?

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Explanation:

New capacity of each bucket is 17 litre which is 1/3 of 51.

Since number of buckets is inversely proportional to capacity of each bucket,
required number of buckets
=13×3=39

Hence, option 3 is the correct answer.