A solution contains a valuable material M in water. M is recovered from the solution using solvent S. If 9 kg of S is used per kg of solution and the distribution equilibrium is X/Z = 3, where X =kg Ml kg water and Z =kg Ml kg S

The % M that will remain in the solution after solvent extraction using

1. Single batch equilibrium stage is ( a. 30% b. 35% c. 25% d. 40%)

2. Two successive batch equilibrium steps using fresh solvent for each step is (a. 16.6% b. 17:6% c. 15.6% d. 18.6%).

Please provide a detailed solution. Thank you!