How to do this math problem Solving the equation of first degree with one variable One sixth of his life is childhood; He lived one twelfth of his life and grew a beard; He got married and spent another seventh of his life; Five years later, I have a son; But the son lived only half of his father's age; After his son died, he lived for another four years and died 1: His life span 2: The age of a father 3: Age at the time of his son's death

How to do this math problem Solving the equation of first degree with one variable One sixth of his life is childhood; He lived one twelfth of his life and grew a beard; He got married and spent another seventh of his life; Five years later, I have a son; But the son lived only half of his father's age; After his son died, he lived for another four years and died 1: His life span 2: The age of a father 3: Age at the time of his son's death

This is the famous Diophantine age problem, the approximate solution: let the Diophantine age be x, let the Diophantine live x years. X = 1 / 6x + 1 / 12x + 1 / 7X + 5 + 1 / 2x + 4x = 25 / 28x + 9x-25 / 28x = 93 / 28x = 9x = 84, without equation, we can see that the number ratio is the common multiple of 6, 12, 7, 2, in which the least common multiple is 84, the least common multiple is 84