The ratio of the volumes of two cubes is 27: 64. What is the ratio of their total surface areas?	Choose the most appropriate option
A) 18:21
B) 81:13
C) 8:15
D) 16:21
E) 1:13
Ratio of the sides   = ³√27 : ³√64 = 3 : 4   Ratio of surface areas   = 32 : 42 = 16:21   Answer:16:21
<result>D</result>
The ratio of the volumes of two cubes is 27: 64. What is the ratio of their total surface areas?