15 grams of body weight in a definite volume of 120 cubic cm find the density?

m = 15 g = 0.015 kg.
V = 120 cm ^ 3 = 0.00012 m ^ 3.
ρ -?
The density of a substance ρ is the ratio of the mass of a substance m to its volume V: ρ = m / V.
ρ = 0.015 kg / 0.00012 m ^ 3 = 125 kg / m ^ 3.
Density ρ = 125 kg / m ^ 3 means that a substance with a volume of 1 m ^ 3 will have a mass of 125 kg.
Answer: the density of the substance from which the body is made is ρ = 125 kg / m ^ 3.