I hate math 10/0... wait... that seems wrong
Nice concept and pretty unique, reminds me how embarrassing my calculator history is.
One problem was the rounding at the doors, i was in a room with all three doors having 1 as a answer. Also i had 144/66 and no door had the right answer or it was rounded. But other than that very fun concept, hopefully my teacher wont use it as the next math test :D