If the length of an edge of cube M is thrice the length of an edge of cube N, what is the ratio of the volume of cube N to the volume of cube M?  Choices:  A) 2/13  B) 1/27  C) 1/5  D) 1/9  E) 1/8
The length of cube N = 1;   The length of cube M = 3;   The ratio of the volume of cube N to the volume of cube M = 1^3/3^3 = 1/27   Answer : 1/27
<result>B</result>
If the length of an edge of cube M is thrice the length of an edge of cube N, what is the ratio of the volume of cube N to the volume of cube M?