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If x + y = 9, z + y = 12, and z + x = 11, what is the average (arithmetic mean) of x, y and z?

If x + y = 9, z + y = 12, and z + x = 11, what is the average (arithmetic mean) of x, y and z?
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If x + y = 9, z + y = 12, and z + x = 11, what is the average (arithmetic mean) of x, y and z?

User CREcker
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x+y=9 \\ z + y = 12 \\ z + x = 11 \\ x+y+ z + y+ z + x=9+12+11 \\ 2x+2y+ 2z=32 \\ x+y+ z=16
User Abhijit Kalamkar
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