Answer:
1/36
Explanation:
Bonnie uses 12×6" = 72" of wire to make her cube.
Roark uses 12×1" = 12" of wire to make each of his cubes. He must make 6³ = 216 cubes to match the volume of Bonnie's cube.
The ratio of wire lengths is then ...
72/(12×216) = 6/6³ = 1/6² = 1/36