If x+y=17z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z?
Choose the correct option.
A) 2z+1 B) 3z C) 6z D) z/3 E) 3z/2
Pick any number like X=12, Y=22 and Z= 2 so that X+Y=17Z, now then the arithmetic mean will be   (12+22+2)/3= 
<gadget id="calculator">  (12+22+2)/3</gadget>
<output>12</output>
12. Now, just look at the answers and put the value of Z there.   (A) 2.2+1=5, no   (B) 3.2=6, no   (6z) 6.2=12, it can be the answer, lets check us the other options   (D) 2/3, no   (E) (3.2)/2=3, no   so the answer will be 6z..
<result>C</result>
If x+y=17z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z?