Draft:Bpow36
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A 7 foot ladder is leaning against a wall and just resting on a box which is 1 foot on a side. See figure. Precisely how high up the wall is the ladder sitting, assuming it is touching higher up the wall than it is out from the wall? The answer must be exact, no approximations!
Problem by Alberto L Delgado, from the now extinct Bradley Problem of the Week.