Let Jais's present age = x years Jais's father's present age = ( x +35) years Sum of their ages after 5 years = (x+5)+(x+35+5)=125 ⇒ 2x+45=125 ⇒ 2x=125−45=80 ⇒ x=
80
2
=40 ∴ Age of jais and his father after 12 years from now = (x+12) and (x+35+12) = 52 and 87 years