Fuifui finds that for Giant moray eels, the mass of an eel `(M)` is directly proportional to the cube of its length `(l)`.
An eel of this species has a length of 15 cm and a mass of 675 grams.
What is the expected length of a Giant moray eel with a mass of 3.125 kg? Give your answer to one decimal place. (3 marks)
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