Written on all contest material in Canada (e.g. a free bag of chips), due to obscure lottery laws and the like, is a statement to the effect:

To win, you must first correctly answer a mathematical skill-testing question.

These typically cancel out nicely and you are left with some nice round number. Once, however, I entered a contest for a barbecue. The answer to the question was 12 and 17/19ths.