A situation came up that has left me a bit stumped. If I saw multiple cars that were each multiple colors, I would ask ¿de qué colores son? However, what happens if there are multiple cars, each a single different color (ie. a red car, a blue car, and a green car)? Would the question still be ¿De qué colores? because there are multiple colors present or would it be ¿De qué color son? since each car is one color. In my textbook it says ¿De qué colores? but I was talking with two Spanish professors (both are native speakers) who say that this is wrong. Any help figuring this out would be greatly appreciated!