The volume of the object : 9 ml
Further explanation
Given
The density of an object : 2 g/ml
Mass : 18 g
Required
The volume
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
V=m : ρ
V = 18 g : 2 g/ml
V = 9 ml