If there are I would buy for friends and myself.

Currently, it's not satisfying at all when I complete a level because the win screen comes up IMMEDIATELY when the total becomes 21. If there was a "confirm answer" button you had to press to get the level complete screen it would be WAY more satisfying. This shouldn't be too hard to add; I like maths and I wanted to like this game but it feels kind of boring when I can just stumble upon the answer and be shunted to the next level without clicking on something...

there was a patch today.

Where are the save files located for this game?

The initial configuration, of Q, A+, A- should work just as well as the answer of A, A-, A+, because A+ divided by A- is the same thing as A- divided by A+.