12 buckets of water fill a tank when the capacity of each bucket is 13.5 litres. How many buckets will be needed to fill the same tank, if the capacity of each bucket is 9 litres?
Correct answer: D. 18
- A. 14
- B. 15
- C. 16
- D. 18
Explanation
The tank's capacity is 12 x 13.5 litres = 162 litres. With 9-litre buckets, the number needed is 162 litres / 9 litres = 18 buckets. The likely mistake is 16 buckets, which comes from an incorrect division or from not first finding the fixed tank capacity.
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