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Unusual solution for problem by Ali Bin Abi Talib

Someone died and he has 17 camels and he mentioned in his will, that half of his camels to person, ⅓ to person and 1/9 to person, but mathematically cannot apply the number to execute the will, no one can solve this problem except Ali bin Abi Talib, he ordered them to add his camel to their camels as follow

17+1 = 18

He gave half of them (nine) to a person

And one third (six) to a person

And one ninth (two) to a person

And his camel remained
ـــــــــــــــــــــــــــــــ

17 the total number is

And his camel returned to him

Note/ Ali Bin Abi Talib is the prophets' caliph of Islam