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 a son was born who died four years before his father at half his final age. How old is Diophantus?

• 84 years
  
  Explanation : X is the Diophantus current age
  x/6 + x/12 + x/7 + 5 + x/2 + 4 = x. Solving this x will be 84.
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