A solid of uniform density ρs floats at the common interface of two immiscible, non-mixing liquids of densities ρ1 (upper) and ρ2 (lower), where ρ1<ρs<ρ2. If the total volume of the solid is V and the volume immersed in the lower liquid is V2, derive an expression for the ratio VV2 in terms of ρ1, ρ2 and ρs.