GRE Question of the Day (January 27th)

Math

If n is the average (arithmetic mean) of the three numbers 6, 9, and k, what is the value of k in terms of n?

(A) \({3n - 15}\)

(B) \({n - 5}\)

(C) \({n - 15}\)

(D) \({\frac{{n - 15}}{{3}}}\)

(E) \({\frac{{n + 15}}{{3}}}\)

Correct Answer - A  - (click and drag your mouse to see the answer)

Question Discussion & Explanation