John K. answered 05/02/19
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Density = mass/volume. The volume of the cube = 3cm x 3cm x 3cm = 27 cm3. The mass is given as 9 kg. Therefor, the density of the material that the cube is made from = 9kg/27 cm3. This may also be expressed as 0.33kg/cm3, or 330grams/cm3.