1. Soybean meal containing 50wt%0il and 50wt% solid are to be leached in a countercurrent multistage process to contain 10kg oil/100 kg inert solid using fresh and pure hexane solvent. For every 1000kg soybeans, 1000kg hexane is used. The following retention of solution with the solids in the underflow, where N is kg inert solid/ kg solution retained and yA is wt fraction of oil in solution is shown in Table 3 . Calculate the amount of flowrate and composition of underflow and overflow leaving an ideal extractor and the number of theoretical stages needed