If the volume of two cones are in the ratio 1 : 4 and their diameters are in the ratio 4 : 5, then the ratio of their heights, is
We have,
Ratio of volume of two cones = 
ratio of their diameter = 
ratio of their radius = 
so,
= 
8
If the volume of two cones are in the ratio 1 : 4 and their diameters are in the ratio 4 : 5, then the ratio of their heights, is
We have,
Ratio of volume of two cones =
ratio of their diameter =
ratio of their radius =
so,
=