it should say that 13 ducks are staying at home
not 13 of them.
( icklepeach *relurks*, Fri 12 Jan 2007, 11:45, archived)

Very much this
poorly-worded problem.
( the mighty badger Aphrodite, on a bar stool, by your side, Fri 12 Jan 2007, 11:49, archived)