John Huthmaker wrote

I noticed that in both the Sporty's and AOPA aircraft contests (the annual
airplane giveaways), their rules stipulate that if the winner is Canadian,
they will have to pass a math test to recieve the prize. If they fail to
answer the math question correctly, they will find another winner.

I discovered the question they'll ask. It's at
http://i2.tinypic.com/r7vmg6.jpg

Jon