Touted as one of the toughest riddles, Einstein's Riddle was written by Einstein when he was a young man. He had estimated that only 2 percent of the people who attempt it can solve it.
"Variations of this riddle appear on the net from time to time. It is sometimes attributed to Albert Einstein and it is claimed that 98% of the people are incapable of solving it. Some commentators suggest that Einstein created such puzzles not to test out intelligence but to get rid of all the students who wanted him as an advisor. It is not likely that there is any truth to these stories. Wherever this comes from, it is a nice riddle," a report available on Stanford University website says.
