I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Wednesday, March 28, 2012
An Unplowed Field
A harvest sown and reaped on the same day
in an unplowed field,
which increases without growing,
though it is eaten within and without,
is useless yet the staple of nations.