Lenny Conundrum

plz help

Dr. Sloth wanted his own Abominable Snowball, but unfortunately, there was no snow in the Virtupets Space Station. So, he had a snow machine built. The snow machine worked great, but it filled up almost the entire room, and therefore the Abominable Snowball needed to be assembled in another room. And to prevent the snow from melting before he could build it, he had a group of Grundos ready with buckets to transport the snow to another room to start building.

If each Grundo only carries one bucket, and if the bucket is a cylinder 20cm in diameter by 30cm tall, and if an Abominable Snowball requires a sphere of snow 60cm in diameter and another sphere of snow 110cm in diameter, how many Grundos are required to build three Abominable Snowballs?

thank you ur help is much appreciated!