Question 521051
let c be Cesar's age and s his son's.
  
 Cesar is now 8 times as old as his son, means   c = 8s
in 4 years, he will be 4 times as his son, means c+4= 4(s+4)

    c + 4= 4s + 16  

   8s + 4= 4s + 16

  4s = 12
 
 s=3,  so c=8*s=8*3=24

so Cesar is 24 and his son is 3.