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20 Buckets of water fill a tank when the capacity of each bucket is 18 litres. How many buckets will be required to fill the same tank if the capacity of each bucket is 9 litres?

A.30
B.40
C.60
D.Data inadequate
Answer and Feedback
Answer:B
Feedback:20 buckets of water fill a tank when the capacity of each bucket is 18 litres.
∴ Capacity of the tank = 20 × 18 = 360 litres
∵ in the second case, Capacity of each bucket = 9 litres
Number of buckets needed = Total capacity of the tank/capacity of one bucket
∴ No. of buckets required = 360/ 9 = 40
Thus, 40 buckets are needed to fill the tank, if the capacity of each bucket is 9 litres.

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