If the length of the sides of two cubes are in the ratio 5:1, what is the ratio of their total surface area?
Choose the correct choice from the following answers:
A) 5:1 B) 10:1 C) 25:1 D) 50:1 E) 150:1
Let x be the length of the small cube's side.   The total surface area of the small cube is 6x^2.   The total surface area of the large cube is 6(5x)^2=150x^2.   The ratio of surface areas is 25:1.   The answer is 25:1.
<result>C</result>
If the length of the sides of two cubes are in the ratio 5:1, what is the ratio of their total surface area?