Hey! I'm Norbert from Germany and I found the following problem which was on Harvards Admissions Test in 1869: a+b+c=214 a+b=3c c+b=0.5a I solved the problem pretty quick and was wondering if there were more solutions other than real ones.
It's a linear system with one unique solution made of rational numbers (428/3, 107/6, 107/2). I don't see how a complex solution is possible.