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Mathematics, 20.08.2019 15:30 kfloyd6046

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?...
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