Henry Ernest Dudeney/Puzzles and Curious Problems/228 - The Ladder

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Puzzles and Curious Problems by Henry Ernest Dudeney: $228$

The Ladder
A ladder was fastened on end against a high wall of a building.
It was unfastened and pulled out $4$ yards at the bottom.
It was then found that the ladder had descended just one-fifth of the length of the ladder.
What was the length of the ladder?


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