arithmetic - eighteen years ago gunasekhar was three times as old as his son now the father is only twice as old as his son then the sum of the present ages of the son and the father is - skillgun

Let the present ages of Father and Son be 2x years and x years respectively.
Then (2x-18)=3(x-18)
2x-18=3x-54
x=54-18
x=36.
Required sum = (2x+x) =3x =3x36 =108 years.