Life of Diophantine: Solution: x-[(1÷ 6) x+(1÷12) x+(1÷ 7) x+5+(1)
Diophantine's father's age: 84× (1÷ 6+1÷12+1÷ 7)+5 = 38 (years old) A: Diophantine's father's age is 38.
Diefantu's son died at the age of 84-4=80 (years old) A: Diefantu's son died at the age of 80.