GRE Question of the Day (September 27th)

Math

x and y are positive integers. If the greatest common divisor of x and 3y is 9, and the least common multiple of 3x and 9y is 81, then what is the value of 81xy?

A) \({3^5}\)

B) \({3^5}\)

C) \({3^7}\)

D) \({3^8}\)

E) \({3^9}\)

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

Question Discussion & Explanation