SOLUTION: If x+y=12, and y+z=11 and z+x=13, what is the average of x, y and z?

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Question 316955: If x+y=12, and y+z=11 and z+x=13, what is the average of x, y and z?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Add all the equations together,
x%2By%2By%2Bz%2Bz%2Bx=12%2B11%2B13
2x%2B2y%2B2z=36
x%2By%2Bz=18
highlight%28%28x%2By%2Bz%29%2F3=6%29