A large container, open at the top, is half-filled with water (?H2O = 1000 kg/m3). On top of this, filling the container, floats a layer of oil (?oil = 700 kg/m3). Into this two-layer fluid is immersed a cube of side length L of wood whose density is ?W = 900 kg/m3. Determine the fractions of the cube immersed in water and oil.