Usenet Newsgroups : rec.puzzles Hall of Fame The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided. Many of these puzzles also appear in Braingle's own collection.

rec.puzzles Newsgroup FAQ Hall of Fame alt.brain.teasers Newsgroup FAQ

A 3' * 3' packing case is placed against a wall.  A 15' ladder is
placed such that it touches the floor, the edge of the packing case and
the wall.

The question is:

How high up the wall is the ladder?


    |
  ^ |\
    | \
    |  \
    |   \ 15
  ? |    \
    |     \
    |      \
    |_______\ 
    |   3   |\
    |      3| \ 
  v |_______|__\___________________
   

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