If I consider a system give like this
where W represents water and O represents any other liquid denser than water and the black object is a sphere of unknown density. according to a question i have to calculate density of sphere on basis of the part of sphere immersed in liquid and water respectively. when i look at the solution it considered the buoyant force from both liquid and Water. I get the buoyant force by liquid part but what i don't understand why water would apply any buoyant force because there is no water below the sphere to exert force on it , only the surface in contact with water would exert force that too in downward direction. So why did the solution had both the buoyant force acting on the sphere.