3cm is a measure of distance, with dimension [L]. Density is a measure of denseness (as the name suggests) with dimensions [ML-3]. Basic dimensional analysis teaches that you cannot relate quantities with such diverse dimensions without additional information.
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The volume of a rectangular solid with those dimensions is 27 cm3.If we also knew its mass, then we could calculate its density.
The volume is 3cm * 2cm * 5cm = 30 cm3. The density will depend on the mass of the prism which will depend on the material that the prism is made from.
5 g/cm^3.
Density = mas/volume = 12 g/27 cc = 0.44... recurring grams per cubic centimetre.
54 cm2