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Work Shown:
density = mass/volume
d = m/v
d = (60 grams)/(3 cubic cm)
d = (60/3) g per cm^3
d = 20 g per cm^3
d = 20 g/cm^3
This means that each cubic centimeter of material has about 20 grams of mass.
A cubic centimeter is a cube that has all sides each 1 cm.