If the length of the sides of two cubes are in the ratio 7:1, what is the ratio of their total surface area?  Select
A) 7:1 B) 14:1 C) 21:1 D) 42:1 E) 49:1
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(7x)^2=294x^2.   The ratio of surface areas is 49:1.   The answer is 49:1.
<result>E</result>
If the length of the sides of two cubes are in the ratio 7:1, what is the ratio of their total surface area?