1. The problem statement, all variables and given/known data http://img51.imageshack.us/img51/7789/imagesj.png [Broken] a, b, c are different digits. Figure out A. 2. Relevant equations ~ 3. The attempt at a solution As far as I know, 2A+ 11B = 111C A + A + B = X + C but the leading digit is added to B in the next column to get C Not sure though. I'm probably overlooking the answer to this one.