If x+y=2z, 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 answers.
A) 2z+1  B) 3z  C) 5z  D) z  E) 3z/2
Pick any number like X=12, Y=10 and Z= 11 so that X+Y=2Z, now then the arithmetic mean will be   (12+10+11)/3= 
<gadget id="calculator">  (12+10+11)/3</gadget>
<output>11</output>
11. Now, just look at the answers and put the value of Z there.   (A) 2.11+1=23, no.   (B) 3.11=33,no   (C) 5.11=55, no   (z) 11, it can be the answer, lets check us the other options   (E) (3.2)/2=3, no   so the answer will be z..
<result>D</result>
If x+y=2z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z?