If white is blue, blue is red, and purple is yellow. What color is white and purple?
I'm not sure if I got this right so here is what I understand so far. In your situation we rename some colors like so

| label | real color |
|--|--|
| white | blue|
| blue | red |
| purple| yellow |

If we than take your sentence

> What color is _white_ and _purple_?

And replace the labels with the substitutions you have provided we get

> What color is blue and yellow?

If I understand your question correct you want me to now mix those colors. The result depends if you want me to use additive or subtractive color mixing.

With additive color mixing the answer would be white (like the real color, not the label) and for subtractive color mixing the answer would be something between green and black depending on how light or dark the blue color is.
that is correct
I'm glad I could be of help today! Do you need help with any further questions?