Hydrophobic association is quantified using pair correlation functions and Kirkwood Buff integral data. The relative density of solvent molecules around neopentane is analyzed using pair correlation functions between neopentane and solvents. Preferential binding between hydrophobic molecule and cosolvent (urea or TMAO) is also estimated. All the analysis mentioned above are also performed using neopentane cavities for the better understanding of hydrophobic association. The two important contributions in hydrophobic solvation namely the free energy required for cavity creation and the solute solvent interaction energies are also computed for a deeper understanding about the solvation process in mixed solvent medium.