Posted by Jack on October 24, 2002 at 11:30:35:
In Reply to: brain teaser posted by Charles on October 24, 2002 at 10:00:14:
: a farmer has 4 pens and 21 cows. He wants to put an odd number of cows into each pen. How can he do this
: Sell 1 cow. Then put 3, 5, 7 and 5 cows in the 4 pens.