Question 935552
Let set Rani's age = x and rewrite the question

If 12 are added to 2/3 of x, the final result will be x+3 

So we have the equation:

12 + 2/3x = x + 3 

Now we just solve the equation :D 

12 + 2/3x = x + 3 -> multiply 3 to both sides to get rid of the bottom 3

36 + 2x = 3x + 9
 27 = x 

So Rani's present age is 27 years old.

:D