Question $3.$

Meat material $(15\%$ protein, $20\%$ fat, $64\%$ water and $1\%$ inert, insoluble solid$),5$ times the mass of fat it is attached with solvent. In balance, the fat, solvent and water dissolve in each other, and the meat the oil in the material is also dissolved in this mixture. After the mixing process, the mixture is filtered by doing this, the solid phase is separated from the liquid phase. Volatile substances in the solid phase with the drying process he is being suspended. The solid that comes out of the dryer is $50\%$ of the weight of the filter cake. Fat, protein and based on the fact that the inert substance is not volatile, the proportion of oil in the solid coming out of the dryer calculate.

Tip : When calculating the mass fraction of the oil in the filtrate, it is estimated that the filtrate contains $20kg$ of oil, $64kg$ of water and $500kg$ of solvent it can be assumed.