In which direction and why will osmosis occur if a 15% sugar solution is separated from a 25% sugar solution by a selectively permeable membrane?

Water follows solute so it this case water will follow that 25% solution.

From the 25% to the 15%.

Explanation:

Osmosis will occur from a high concentration to a lower concentration until an equilibrium is achieved.

   

The water table level can vary in different areas and even within the same area. Fluctuations in the water table level are caused by changes in precipitation between seasons and years. ... If water is not extracted through a well in a sustainable manner, the water table may drop permanently.