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Daily Brain Teaser / Puzzle
November 13, 2006
Previous Days Teaser -- Want More? -- Next

The new art gallery has twenty walls, each wall being at right-angles to its adjoining walls. Without know­ing the precise design of the gallery, what is the least number of guards that will guarantee that all the walls can be kept under observation all the time?

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THE SOLUTION

Five is sufficient for a gallery of twenty walls at right-angles.