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800 kg/hr of an (A-C) mixture containing 20% by weigh of C is to be counter currently extracted with solvent B. the recovered solvent to be used is free from C. the (A)and (B) are insoluble. If 85% recovery of (C) is desired. Estimate the number of stage required if 1.3 times the minimum solvent is used. Equilibrium data X' 0.05 0.10 0.15 0.20 0.25 Y 0,04 0.08 0.12 0.16 0,20