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The equilibrium distribution of a solute C between solvents A and B (up to 30% of C in solution in A) is given by Y = 3.75 X, where X and Y are the concentrations of C in A and B respectively, both in mass ratio unit that is, mass of solute per unit mass of solute-free solvent. The solvents A and B are practically immiscible. It is required to calculate the amount od the solvent B required to separate 95% of C from 1000 kg of a 15% (by mass) solution of C in A for the following separation schemes (a) an ideal single-stage contact (b) an ideal three-stage cross current contact, the amount of solvent used in each stage being equal