Three photographers and three cannibals come to a river. The boat can carry only two people at a time. The cannibals will eat any group of photographers that they outnumber (on either side of the river). How can all six people safely cross the river?
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A cannibal and a photographer cross the river together. Then the photographer rows back alone.
Now two cannibals cross and one of them returns.
Next two photographers cross and one of them returns along with a cannibal.
Now two photographers cross and one cannibal returns.
Finally two cannibals cross, and one of them returns to pick up the last cannibal.
I think this was originally a Mensa puzzle. I found it in James F. Fixx’s Solve It!, from 1978.
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