I learned a lot of things during my recent trip to Minneapolis, but the most important was how to solve logic puzzles. The fact that I can now tackle a reasonably difficult puzzle is pretty striking, since I used to be hopeless at them.
So when I ran across this classic I just HAD to try and solve it, and I'm proud to say it only took me...errr, fifteen minutes. That might not be so hot but I'M pretty pleased with myself.
"DONALD + GERALD = ROBERT" is a mathematical cryptogram. Each of the ten letters stands for one of the digits from 0 to 9. None of the digits stand for more than one letter. As a starter, the letter "D" stands for "5".
For those of you (like me) who hate puzzles that require trial and error to solve, don't worry; this one is unambiguous.