SET THEORY MATH H.W HelP!?

[Tony Hernandez]

If n(B) = 305, n(A ? B ? C) = 90, n(A ? B ? C^C) = 115, and n(AC ? B ? C) = 50, what is n(AC ? B ? C^C)?

and

If n(A ? B) = 40, n(A?B^C) = 70, and n(A^C?B) = 60, what is n(A ? B)?


^c means the complement of that set