Two men were discussing which one of them owned the best horse. To find out, they decided to organize a match. Because both of the men did not like to loose, they agreed on doing a ride as slow as possible. The last horse which would pass the finish would be the best one. The match started, but of course it did not proceed at all. After several hours the horsemen jumped of their horses and agreed upon something. After this short talk they jumped back on the horses and went with full speed to the finish. What did they agree upon?

A hobo who does like to smoke cigars but does not have any money, collects cigars stumps. From every six stumps he finds he can make a new cigar. One a particular day he finds 36 stumps. How many cigars can he smoke on that day?

Suppose you would like to boil an egg for exactly 15 minutes. But you only have two hourglasses, one of zeven and one of eleven minutes. What is the the fastest way to do this?