12 buckets of water fill a tank when the capacity of each bucket is 13.5 liters. How many buckets will be needed to fill the same tank, if the capacity of each bucket is 9 liters?

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A. 8   
B. 15
C. 16   
D. 18
Answer:  D

Explanation:     

Capacity of the tank = (12 * 13.5) liters = 162 liters.
Capacity of each bucket = 9 liters
Number of buckets needed = (162/9) = 18.

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