Question 947726
let the son's age be x.
Then the man's age is 4x.
In five years time their ages will be (x+5) and (4x+5)
(4x+5)=3(x+5)
4x+5=3x+15
x=10
The man's age is 40.
The son's age is 10 and the man's age is 40 years.