First, imagine the creature as small, or human sized, and think how much it would weigh. Let's take a hypothetical girl 'Jane' for starters. Jane is five feet tall, and weighs 110 pounds. Now, how much would Jane weigh if she was a 55ft tall version of herself?
Calculate how many times over her old hight that is: 55 ft / 5 ft = 11
Jane is 11 time taller now.
It's tempting to say her weight would also be 11 times bigger: 11 x 110 lb = 1210 lb
Sounds like a lot maybe, but this would only account for the weight of a 55 ft tower of 11 normal sized Janes standing on each other's shoulders. If that tower were a single person, she would be only as wide as the original Jane. Yikes!
To get to her final hight, Jane needs to grow...
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