If x+y= 8z, which of the following represents the average (arithmetics mean) of x, y and z in terms of z?

If x+y= 8z, which of the following represents the average (arithmetics mean) of x, y and z in terms of z?

A 2z+1

B 3z

C 5z

D z/3

Solution

Correct Answer: Option B

x+y=8z or, x+y+z=8z+z or, x+y+z=9z then average = 9z/3 = 3z