Explanation
Let the current age of the son be x. Then 3 years ago, the father was 24 years older than his son.
Therefore 3 years ago, father's and sons age was
[tex]\begin{gathered} father^{\prime}s\text{ age=x+24-3} \\ son^{\prime}s\text{ age = x-3} \end{gathered}[/tex]Now the father is 5 times older that the son. ie
[tex]\begin{gathered} fathers\text{ current age =5x} \\ sons\text{ age = x} \end{gathered}[/tex]Based on theis,