SOLUTION: about all we know of Diophantus personal life is that contained in the following summary of ipitaph given in the greek Anthology. Diophantus passed onesix of his life in childhood,

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Question 158504: about all we know of Diophantus personal life is that contained in the following summary of ipitaph given in the greek Anthology. Diophantus passed onesix of his life in childhood, one twelve in youth and one seventh more as a bachelor. Five years after his marriage was born a son who died four years before his father, at half his father, at half his father's {final)age. How old was Diophantus when he died.
Answer by Edwin McCravy(20056) About Me  (Show Source):
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About all we know of Diophantus personal life is that contained in the following summary of ipitaph given in the greek Anthology. Diophantus passed one sixth of his life in childhood, one twelfth in youth and one seventh more as a bachelor. Five years after his marriage was born a son who died four years before his father, at half his father, at half his father's {final)age. How old was Diophantus when he died.

Suppose Diophantus was N years old when he died.

>>...Diophantus passed one sixth of his life in childhood,...<<

His childhood lasted N%2F6 years.  Therefore,
he was N%2F6 years old when his childhood ended.

>>...one twelfth in youth...

His youth lasted N%2F12 years so he was N%2F6%2BN%2F12 years 
old when his youth ended.

>>...and one seventh more as a bachelor...<

His bachelorhood lasted N%2F7 years so he was N%2F6%2BN%2F12%2BN%2F7 
years old when his bachelorhood ended.

>>...Five years after his marriage was born a son...<< 

His childless marriage lasted 5 years, so he was N%2F6%2BN%2F12%2BN%2F7%2B5 
years old when his childless marriage ended.

>>...who died...at half his father's {final)age...<<

His life with a live son lasted N%2F2 years, so 
he was N%2F6%2BN%2F12%2BN%2F7%2B5%2BN%2F2 years old when his son died.

>>...who died four years before his father,...<<

So he was N%2F6%2BN%2F12%2BN%2F7%2B5%2BN%2F2%2B4 years old when he died.

And he was also N years old when he died. So we set 
these equal:

N=N%2F6%2BN%2F12%2BN%2F7%2B5%2BN%2F2%2B4

Combine 5 and 4:

N=N%2F6%2BN%2F12%2BN%2F7%2B9%2BN%2F2

Clear of fractions by multiplying through by LCD=84



84N=14N%2B7N%2B12N%2B756%2B42N

Combine like terms:

84N=75N%2B756

Add -75N to both sides:

9N=756

Divide both sides by 9

N=84

Diophantus was 84 years old when he died.

Edwin

AnlytcPhil@aol.com