What color do you get when you mix red purple and orange?

When mixing the colours Red, Purple and Orange, I will assume that you are using equal amounts of each and that the secondary colours are true mixes.

Red is a primary colour, so in this equation I will list it as 2 parts Red.

Purple is a secondary colour, so in this equation I will list it as 1 part Red + 1 Part Blue.

Orange is a secondary colour, so in this equation I will list it as 1 part Red + 1 part Yellow.

Your equation therefore gives us: 4 parts Red + 1 part Blue + 1 part Yellow = a medium tone, warm brown.