a. calculate mass flowrate of solvent C in stream 4

b. Calculate the composition of stream 6

3. In a liquid-liquid extraction process, solvent C is used to extract solute B from a mixture of solvent A and solute B. In each stage of the 2-stage extraction process, 90.0% of the solute B that enters in the solvent A and solute B feed stream is extracted and leaves in the Solvent C outlet stream. The 2 solvents are immiscible, meaning they do not mix together. Use this space to write your balances and equations