Organic Chemistry

Simple Distillation: What is the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 60% A and 40% B? I know that the vapor should be richer in the lower-boiling substance, which is A in this case.
And: If a sample of the vapor has the composition of 50% A and 50% B, what is the composition of the boiling liquid? Would the liquid composition also be 50% A and 50% B?
Can anyone explain?

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