Answer:
60
Step-by-step explanation:
Volume of cone = volume cylinder
[tex](\frac{\pi h r^{2} }{3}) = \pi r^{2} h[/tex]
This means that the volume of the cone is 1/3 of the volume of the cylinder, assuming that both have the same base and height. Therefore, in order to get the volume of the cylinder we times it by 3.
20 * 3 = 60.
Hope this helps