Alpha Blending Calculator

Hello there,

does anyone know a color blending calculator where one can combine colors back and forth?

Here https://en.wikipedia.org/wiki/Alpha_compositing we see how it works mathematically. Where can we actually find out what color is A if (lets say) 50% A multiplied with 80% B = C. And we know what color is C and B? Like if I want to get a certain color by overlaying a certain color with some other color I don't yet know.