Two cones have the same radii but one has a height four times larger than the other. How many small cones would be needed in order to have the same volume as the larger cone?

4

8

16

64

Since the radius is the same but the height changes, the volume would change by the multiple of the height.

In this case the volume of the larger cone would be 4 times as large as the smaller cone so you would need 4 small cones