Approximately 90 percent of the volume of a certain cube that is floating in a tank of water is beneath the surface. If 6.4 cubic centimeters of the cube is above the surface of the water, what is the approximate length, in centimeters, of an edge of the cube?

GMAT QUANT Problem Solving, Difficulty: 500 – 600 Level, Geometry VOLUME, CUBE, Percent And Interest Problems, Source: GMAT Prep

Approximately 90 percent of the volume of a certain cube that is floating in a tank of water is beneath the surface. If 6.4 cubic centimeters of the cube is above the surface of the water, what is the approximate length, in centimeters, of an edge of the cube?

A. 10
B. 8
C. 6
D. 4
E. 2