Question 759937
the sum of the ages of a father and son is 85 years.
let the age of father is x 
so the son's age=85-x
five years ago, 
the age of father was=x-5 
the son's age=85-x-5=80-x
APQ the father was exactly four times as old as his son. 
x-5 =4(80-x)=320-4x
or 5x=325
or x=the present age of the father=325/5=65