the work of the ancient greek mathematician diophantus had great influence on later European number theorists.Nothing is known about his personal life except the info given in the following epigram,"Diophantus passed 1/6 of his life in childhood,1/2 in youth and 1/7 more as a bachelor.Five years after his marriage was born a son who died 4 years before his father, at a half his father's final age".How old was Diophantus when he died?