Question 584702
son age =x
father -age = x+30

last years

son - age = x-1

father-age = (x+30)-1= x+29

(x+29)= 4(x-1)
x+29 = 4x-4

4x-x= 29+4
3x=33

/3
x= 11 years   son's age

father's age = 30+11= 41 years