Cannibals and Missionaries
Three missionaries and three cannibals want to cross a river in a small boat. The boat can only carry two at a time. The cannibals must never outnumber the missionaries on either shore, even if one stays in the boat. How can they all cross the river?
Cannibals and Missionaries - Solution
Two cannibals cross, one comes back. Two cannibals cross, one comes back. Two missionaries cross, one missionary and one cannibal come back. Two missionaries cross, one cannibal comes back. Two cannibals cross, one comes back. Two cannibals cross, everybody is across.
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