If x+y=5z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z? Choose the correct choice from the following
A) 2z+1	B) 3z	C) 2z	D) z/3	E) 3z/2
Pick any number like X=12, Y=8 and Z= 4 so that X+Y=5Z, now then the arithmetic mean will be   (12+8+4)/3= 
<gadget id="calculator">  (12+8+4)/3</gadget>
<output>8</output>
8. Now, just look at the answers and put the value of Z there.   (A) 2.4+1=9, but it should be 8.   (B) 3.4=12,no   (2z) 2.4=8, it can be the answer, lets check us the other options   (D) 4/3, no   (E) (3.4)/2=6, no   so the answer will be 2z..
<result>C</result>
If x+y=5z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z?