Meat material $(15\%$ protein, $20\%$ fat, $64\%$ water and $1\%$ inert, insoluble solid$)$ is extracted with $5$

times its mass of fat solvent. At equilibrium, fat, solvent and water dissolve in each other, and

the fat in the meat material also dissolves in this mixture. After mixing, the mixture is filtered and the

solid phase is separated from the liquid phase. Volatile substances in the solid phase are removed

by the drying process. The solid leaving the dryer is $50\%$ of the weight of the filter cake. Considering the.

fact that fat, protein and inert matter are not volatile, calculate the oil ratio in the solid coming out

of the dryer.

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