(1). Life of Diophantine:

Solution: x =1/6x+112x+1/7x+5+1/2x+4.

x=25/28x+9

x-25/28=9

3/28x=9

x=9*3/28

x=84

A: It can be seen that Diophantu lived to be 84 years old.

(2). The age when Diophantine began to be a father:

84× (1/6+112+1/7)+5 = 38 (years old)

A: Diophantu became a father at the age of 38.

(3) Diefantu's son died of age:

84-4=80 years old

A: When my son died, Diophantu was 80 years old.

I just made this the other day. ...