The Official Guide For GMAT® Quantitative Review, 2ND EditionIf x + y= 8z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z ?

(A) 2z + 1

(B) 3z

(C) 5z

(D) z/3

(E) 3z/2

Problem Solving

Question: 104

Category: Arithmetic Percents

Page: 75

Difficulty: 550

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