If x + y = 6 , y + z = 7 , and z + x = 9 the average (arithmetic mean) of x , y and z is? - IQ786

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If x + y = 6 , y + z = 7 , and z + x = 9 the average (arithmetic mean) of x , y and z is?

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