A rectangular prism is made up of two connected cubes, each with side length e.

PART A
The edge length of the prism is 5 centimeters.

What is the surface area?

PART B
The prism is partially filled with 150 cubic centimeters of sand.

What fraction of the prism is filled by the sand?

PART C
Is the prism’s surface area equal to its volume? Explain your reasoning.