Henry Ernest Dudeney/Modern Puzzles/96 - Concerning a Cube

by : $96$

 * Concerning a Cube
 * What is the length in feet of the side of a cube when
 * ''$(1)$ the superficial area equals the cubical contents;
 * ''$(2)$ the superficial area equals the square of the cubical contents;
 * ''$(3)$ the square of the superficial area equals the cubical contents?