this is probably the wrong way to solve this but i would just use a simple and fast point system:

"The various averages (arithmetic means) of three of the four numbers c, d, e, and f are calculated, and are arranged from greatest to least as follows

The average of c, d, and e *** anything in this row 4 points)

The average of d, e, and f *** anything in this row 3 points)

The average of e, f, and c** " " " " 2 points)

The average of f, c, and d**** " " " " 1 point)

Which of the following correctly orders c, d, e, and f from greatest to least?

(A) c > d > f > e

(B) d > f > e > c

(C) d > e > c > f

(D) e > c > f > d

(E) e > d > c > f"

and it works out to (E) e>d>c>f

e=9 pnts

d= 8 pnts

c= 7 pnts

f= 6 pnts

again thats how i usually solve things like that its not really the right way but it works most of the time