A container in the shape of a cube has edge length 20\:cm and contains some water. A solid gold cube, with edge length 15\:cm, sinks to the bottom of this container, causing the water level to rise just to the top of the solid cube. Which of the following is closest to the original depth of the water?
Answer Choices
A. 6.56\:cm
B. 8.25\:cm
C. 10.50\:cm
D. 5.31\:cm
E. 7.50\:cm
