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by William Armstrong
22 Sep 2012
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Flipping Glasses Puzzle

Genre: Math Puzzle Rating: 5 - Medium Source: Unknown
Brain Functions: Exact Calculations, Analysis Hint    Solution

Seven glasses (tumblers) are sitting upside down on a table top. You want to turn them all right-side-up in the smallest number of moves. A 'move' consists of turning over three glasses at once. The glasses don't have to be adjacent, but you must turn over three at a time. How many moves are required? How many moves would it take if a move involved turning over exactly four glasses at a time?

Flipping Glasses Puzzle

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