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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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