Question 1
In 9 years, Dominic will be twice as old as Gopal was 3 years ago. If Gopal is 12 now, how old is Dominic now?
In 9 years: Dominic=Dominic(now)+9, Gopal was 12-3=9 three years ago. Dominic(now)+9=2*9 => Dominic(now) = 2*9 - 9 = 9.