The ratio between the radii of two spheres is 1:3. Find the ratio between their volumes?	Select: A) 1:28 B) 1:27 C) 1:18 D) 1:21 E) 1:12
r1 : r2 = 1:3   r13 : r23 = 1:27   Answer: 1:27
<result>B</result>
The ratio between the radii of two spheres is 1:3. Find the ratio between their volumes?