Density of the substance = Mass / Volume = 50 / 20 = 2.5 g/cm3
Density of water = 1 gm/cm3
Density of the substance > Density of water
Relative density of the substance = \(\frac{2.5\,gm/cm^3}{1\,gm/cm^3}\) = 2.5
Relative density of the substance = Weight of the substance / Weight of the water equal to the volume of the substance
⇒ 2.5 = 50 / x
⇒ x = 50 / 2.5 = 20 g
∴ Weight of the water displaced by the substance = 20 g