If x + y = 6 , y + z = 7 , and z + x = 9 the average (arithmetic mean) of x , y and z is?
- 11
- 11/3
- 11/2
- None of these
Explanation
Given:
x + y = 6
y + z = 7
z + x = 9
Add the three equations:
2(x + y + z) = 22
Divide by 2:
x + y + z = 11
The average of x, y, and z is:
(x + y + z)/3 = 11/3
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