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Prehistoric Math
Thanks Jurassic Parc

mammoth

While ambling through Jurassic Parc, the mammoth wonders:
"How many ankylosauruses will it take to reach my weight?"
Hints:
Five pterodactyls weigh the same as one stegosaurus.
Ten ankylosauruses weigh the same as one pterodactyl.
Thirty stegosauruses weigh the same as one mammoth.
Question:
How many ankylosauruses will it take to weigh the same as one mammoth?
See answer

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