Density of the material, ρ=3g∕cc Density of the fluid, σ=7g∕CC Let the volume of the material be V and n portion of the volume of the block submerged in the fluid. ∴ Weight of the fluid is Vρg and weight of the submerged part is nVσg According to the condition of equilibrium of a floating body. Vρg=nVσg ⇒n=
ρ
σ
=
3
7
∴ The fraction of volume of the block outside the fluid is 1−n=1−