s, t ,u, M, N and P are integers.

s + 2t = M

t + 2u = N and

u + 2s = P.

What is the average of M, N and P in terms of s, t and u?

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s, t ,u, M, N and P are integers.

s + 2t = M

t + 2u = N and

u + 2s = P.

What is the average of M, N and P in terms of s, t and u?