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GRE - Quantitative Reasoning - Algebra

If 1+x+x2+x3=60, then the average (arithmetic mean) of x, x2, x3, and x4 is equal to which of the following?

If 1 x x2 x3=60, then the average (arithmetic mean) of x, x2, x3, and x4 is equal to which of the following?

A. 12x
B. 15x
C. 20x
D. 30x
E. 60x

Arithmetic mean of x, x2, x3, and x4 =  (x + x2 + x+ + x4) / 4 = x(1+x+x2+x3)/4

= x*60/4 = x*12

12x

Option A is correct