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by William Armstrong
17 Nov 2012
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Ladder Slippage Puzzle

Genre: Geometry Puzzle Rating: 6 - Medium to Hard Source: Unknown
Brain Functions: Analysis, Exact Calculations Hint    Solution

A ladder is held flat against a vertical wall. The foot of the ladder is then allowed to slide 15 feet away from the wall along the horizontal ground. The top of the ladder is still touching the wall, but it is now four fifths of the height that it was before the slide. How long is the ladder?

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