This one can be done by assuming each one to be true, as you can then test for a logical contradiction. If there is a logical contradiction when something is assumed to be true, it must be false. With this logic, I found that Z is true, so X is Blue, Y is Red and Z is White.

This one can be done by assuming each one to be true, as you can then test for a logical contradiction. If there is a logical contradiction when something is assumed to be true, it must be false. With this logic, I found that Z is true, so X is Blue, Y is Red and Z is White.