Can you notice there is a trickster?

One day, a king in my country died and he left a will. It said “My three dear sons, I will give you my 35 pretty camels. The first-born son can get half of all of my camels, the second- born son can get one third of all of my camels; and the last-born son can get one ninth of all of my camels. Please don’t fight each other.” So they intended to divide the camels amongst themselves but they couldn’t.

The first-born son calculated the number of camels, the amount was 17.5. It wasn’t possible to divide them. While they were thinking, a man told them that he could solve their problem. He said “Firstly, I will lend you my one lovely camel. The amount of camels becomes 36. The number will be easy for us to divide’. Thanks to him, the first-born son got 18 camels, the second-born son got 12 camels and the last-born son got 4 camels. However the sum of their camels was 34. So the man brought back two camels because two camels were left.