I'm assuming that you meant to write 3cm3 for the volume.
Density = mass/volume = 21g/3cm3 = 7g/cm3.
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3cm, 3cm and 3cm respectively
Volume = (length) x (width) x (height)A cube has all 3 dimensions equal.Volume = (3cm) x (3cm) x (3cm) = 27 cm3
Its volume is 27cm3
12x7x3=252
You cube the length of the side: 3*3*3 = 27 cubic cm.