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Can you solve the river crossing riddle? - Lisa Winer

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TEDEd Animation

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As a wildfire rages through the grasslands, three lions and three wildebeest flee for their lives. To escape the inferno, they must cross over to the left bank of a crocodile-infested river. Can you help them figure out how to get across on the one raft available without losing any lives? Lisa Winer shows how.

Suppose the raft can hold 3 animals. What is the maximum number of wildebeest and lions that will be able to cross?

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About TED-Ed Animations

TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Educator Lisa Winer
  • Director Outis
  • Script Editor Alex Gendler
  • Narrator Addison Anderson

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