I'm assuming that you meant 55 g/cm^3. Density=[tex] \frac{Mass}{Volume}[/tex]. This is the definition of density. If you rearrange this equation by multiplying each side of the equation by the volume, you get: (Density)(Volume)=Mass. Divide each side by the density to get: Volume=Mass/Density. Now just plug everything in:
V=220 (grams)/55 (grams/cm^3)=4 cm^3
