Two solid spheres have volumes 250cmo and 128cmo respectively. Find the ratio of their radii.

A. 125:64
B. 25:16
C. 2:1
D. 4:3
E. 5:4

Correct Answer: Option E

E. 5:4

Explanation
4/3πR3 4/3πr3
=
250/180
= (R/r)3 = 5:4