Brain Teaser: A Sliding Ladder

A 25 ft ladder (assume it is not an extension ladder) is placed with its foot 7 ft away from a building. If the top of the ladder slips down 4 ft, how many feet will the bottom slide out?

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  1. Should be 15ft away from the building.

  2. The answer would be 15ft.The ladder would have slipped 15 ft away from the wall.

  3. I get 8.87 ft

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