Rohini's friend age is 12 years, if the ratio of age of Rohini to that of her friend is 4 : 3. Then what will be ratio of their ages after 4 years from now?

5 : 4

                              Rohini   :   Rohini's friend

(given)                    4          :           3

     Rohini friend's age = 12 years 

i.e.   3R = 12 years 

       1R  =  4 years

so, age of Rohini  = 4R

    age of Rohini   = 4 × 4 = 16 years 

   After 4 years , 

  Rohini friend's age  = 12 + 4 = 16 years 

  Age of Rohini    = 16 + 4 = 20 years 

required ratio ,            Rohini   :   Rohini's friend

                                   20       :            16

required ratio,                 5       :            4