If the average of $$\(x\)$$ and $$\(y\)$$ is 15 , the average of $$\(y\)$$ and $$\(z\)$$ is 24 , and the average of $$\(x\)$$ and $$\(z\)$$ is 27 , what is the average of $$\(x, y\)$$, and $$\(z\)$$ ?

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