my friend Osama, I think the question should be what did the judge do to distribute the camels according to their father wish.
17/2 = 8.5 camel !! how can some one take 8 camels and half a camel, so the judge avoided this by adding his camel and now it became 18, and 18/2 = 9, can you buy a dog and half a dog for your house for example? Yes if the dog is dead.