That one is actually pretty easy to beat - the OCR is easy enough, and you can refresh the page until you get an easy question. Some of them are very simple integer arithmetic exercises.

As for the harder questions, Wolfram Alpha is better able to do them than the average human.

I'm not sure about which OCR you're talking about but I've tried ABBYY and because of the fractions ie top and bottom halves the thing craps out. Granted, if you get a single line problem it could easily be solved. Definitely there's the problem of application as well. Since this is a quantum bit service Site, you can expect people to know a minimum of integration. But I don't expect Facebook login to have anything even close to 8th grade mathematics.

I always seem to strike it lucky with that site. I can remember it coming up twice on HN (once now, once a while ago - https://hackertimes.com/item?id=2290466), and both times I got a one-line equation. I didn't save the equation I got this time, but it was maybe five terms long and most of the atoms were zeros.