The density of a rectangle : ρ = 0.372 g/cm³
Further explanation
Given
The volume of rectangle : 395 cm³
Mass : 147 g
Required
The density
Solution
Density is a quantity derived from the mass and volume 
Density is the ratio of mass per unit volume 
Density formula: 
 
ρ = density 
m = mass 
v = volume 
Input the value :
ρ = 147 g : 395 cm³
ρ = 0.372 g/cm³