<pre>
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 ||'' '' '' ''||'' '' '' '' _


[[RecPuzzlesLadder and Box Solution]]
</pre>
