Question 39618
The ratio of the volume of two spheres is 216:125. What is the ratio of their diameters?
VOLUME =(4/3)PI*R^3...HENCE VOLUME IS PROPORTIONAL TO CUBE OF RADIUS AND HENCE  DIAMETER.
SO IF 
V1/V2=216/125...THEN 
D1/D2=CUBE ROOT OF (216/125)=6/5