# GRE Question of the Day (September 27th)

- Sep 27, 02:00 AM Comments [0]

## 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) $${3^9}$$

Question Discussion & Explanation