Final answer:
The Relative Density of the liquid is calculated using the loss of weight of the body in air versus its weight in water and the liquid, which results in a Relative Density of 1.1.
Step-by-step explanation:
To calculate the Relative Density of the liquid, we need to use the weight of the body in air and its weight in the respective liquids. The weight of the body in air is 40 gf and in water is 36 gf. The loss of weight in water gives us the buoyant force, which equals the weight of the water displaced. This is 40 gf - 36 gf = 4 gf. The relative density (also known as specific gravity) is the ratio of the density of a substance to the density of a reference substance; here the reference is water.
The weight of the body in the liquid is 36.4 gf, so the buoyant force is 40 gf - 36.4 gf = 3.6 gf. Since the weights of equal volumes of the liquid and water are in the ratio of their densities, the relative density of the liquid is the weight loss in water divided by the weight loss in the liquid: 4 gf / 3.6 gf = 1.1.