What is the density of a brick of salt that measures 5 cm x 5 cm x 2.5 cm and it weighs 321g?

The density of any object can be derived by dividing its
mass by its volume. Density is expressed in units like kg/m^3, g/cm^3,
etc.

Here the mass of the brick of salt is 321
g.

The dimensions of the brick are 5 cm x 5 cm x 2.5 cm.
This gives the volume of the brick of salt as 5*5*2.5 = 25*2.5 = 62.5
cm^3

The density is 321/62.5 = 5.136
g/cm^3

The density of the brick of salt is
5.136 g/cm^3