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Explanation:
volume of the cube is 5 x 5 x 5 = 125 cm^3
Mass SHOULD be 125 cm^3 * 2.55 g / cm^3 = 318.75 g
Given it is only 306 g
the volume of glass is 306g / 2.55 g/cm^3 = 120 cm^3
the remaining 5 cm^3 is the cavity