Old Navy: Crazy?

So, I went shopping this weekend with Holly and Stacey and made several EXCITING purchases. Purchase #1 will be kept a secret until a later date. Purchase #2 includes two for one long length tank tops from Old Navy and two for one brightly colored t-shirts (Summer 2007, here I come!). We are standing in line at the register, and the cashier hands us some scratch and win game pieces--each card is a winner. I totally won a free bag of Jelly Bellys. It says in fine print, "Subject to verification; see back for details." I'm thinking, "Must be 18 to win; must be accompanied by an adult," perhaps. But, no. Not quite. It did say this, though...

Canadian Residents: You must correctly answer the following skill-testing question to claim your prize/discount. If claimant is under the age of majority, a parent/legal guardian may answer the skill-testing question on their behalf: (10x4)+(3x2)-10+____"

WHAT??!! Is this a joke??! Is this some sort of discrimination against Canadians who are bad at math? Fiona, I am offended for you!