Ternary Liquid$-$Liquid Systems

Consider a ternary liquid system whose phase behavior is

given in the diagram. If a solvent stream of $C$ containing $10\%$

$A$ is used to extract A from a mixture of $40\%A$ in $B,$ answer

the following questions.

What is the maximum purity of the raffinate $($the

stream rich in $B)$ that can be obtained?

If the solvent flow rate is twice the feed flow rate,

what is the mixture composition?