I had to retry registering a few times, as the first random question it gave me, "What is 5+5+5+5" refused to accept "20" as a valid answer. I guess I can get proof that it's supposed to be 20, but I think it may just be a typo somewhere in the random questions files or something. Would be great if that were fixed, to prevent confusion or frustration, seeing as we have a multinational community, and math is the one language that knows no borders.