A rich man in Arabia died, leaving a note for his three sons. It reads: 'I have 17 camels. The big brother can get a half of all, the middle can get third of all, and the youngest can get a ninth of all.' The brothers are left dumbfounded, since 17 cannot be divided by 2, 3 or 9 without anything left. How can the brothers solve the problem? -Riddles