I thought this was a joke when I first read this, from the AOPA win a twin
sweepstakes official rules:

"...In compliance with Canadian law, if winner is a Canadian resident, he or
she must first correctly answer a mathematical skill-testing question before
the prize will be awarded. If the potential winner is unable to correctly
answer the question, AOPA will select an alternate winner."


Can anyone shed some light as to the purpose of this Canadian law? Is this
to keep mathematically-challenged people from owning aircraft?