GRE Math Problem 29

What is the average (arithmetic mean) of 3³⁰, 3⁶⁰, and 3⁹⁰?
(A) 3⁶⁰
(B)3¹⁷⁷
(C)3¹⁰ + 3²⁰ + 3³⁰
(D) 3²⁷ + 3⁵⁷ + 3⁸⁷
(E)3²⁹+3⁵⁹+3⁸⁹

Solution for GRE Math Problem 28:

Is the class average before the adjustment was A, then the average of missed points was 100-A. After the adjustment, the average of missed points became . So, the average of points gained became
Answer:(A)

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