A fish pond of dimensions 20 m × 10 m × 1.5 m is stocked at a rate of 2 fish per cubic metre of water. How many fish are stocked in the pond?
A300
B400
C500
D600CORRECT
GCEAgricultural ScienceFisheries and Forestry2020
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Why the answer is D, and why the others tempt you.
The volume of the pond is 20 × 10 × 1.5 = 300 cubic metres. At a stocking rate of 2 fish per cubic metre, the total number of fish = 300 × 2 = 600 fish. Distractors arise from errors such as omitting one dimension or using incorrect multiplication.
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