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If the average of three numbers is 3 and two of the numbers are 2x – y and x + y, what is the third number in terms of x and y?

A. x+y

B. x-y

C. 6x-2y

D. 9x

E. 6x

Kudos for right answer and explanation

Let k = the 3rd number

So, [k + (2x - y) + (x + y)]/3 = 3x Multiply both sides by 3 to get: k + (2x - y) + (x + y) = 9x Simplify left side to get: k + 3x = 9x Solve for k to get: k = 6x

Answer: E

Cheers, Brent

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Brent Hanneson – Creator of greenlighttestprep.com Sign up for our free GRE Question of the Dayemails