Verified Answer :

jessehill

If the cube is 3 cm on each side, then it has a volume of 27 cm^3 (3 x 3 x 3). Density is mass divided by volume, so its density is 72.9/27 = 2.7 g/cm^3. 

Going by the density, the cube is made of Aluminium - density is a fairly unique quantity

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