We know very little about the life of the mathematician Diophantus (often known as the 'father of algebra') except that he came from Alexandria and he lived around the year 250 AD. 

However, there remains a riddle that describes the spans of Diophantus's life:

"This tomb holds Diophantus. Ah, what a marvel! And the tomb tells scientifically the measure of his life. God vouchsafed that he should be a boy for the sixth part of his life; when a twelfth was added, his cheeks acquired a beard; He kindled for him the light of marriage after a seventh, and in the fifth year after his marriage He granted him a son. Alas! late-begotten and miserable child, when he had reached the measure of half his father's life, the chill grave took him. After consoling his grief by this science of numbers for four years, he reached the end of his life."

In simpler English it says: Diophantus's youth lasted 1/6 of his life. He had the first beard in the next 1/12 of his life. At the end of the following 1/7 of his life Diophantus got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus's life. Diophantus died 4 years after the death of his son.

How long did Diophantus live?

 May 5, 2021

Guest, this is a good contribution to this forum. 

It would have got more positive attention if you had given it a proper title!


I draw a lifeline to answer this


it simplified to




Solving that I got 84.


Diophantus lived a very long life of 84 years.


Here is a wikipaedia link to Diophantus, he really did live around 84 years!   



 May 10, 2021

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