. If the sides of two cubes are in the ratio 3: 1 the ratio of their total surface area is?	Choose the correct choice:
A) 3:2	B) 9:5	C) 9:1	D) 9:9	E) 9:7
Explanation:   a1 : a2 = 3 : 1   6 a12 : 6 a22 = 9: 1   Answer: Option 9:1
<result>C</result>
. If the sides of two cubes are in the ratio 3: 1 the ratio of their total surface area is?