Joan is 24. She is twice as old as Carol was when Joan was as old as Carol is now. How old is Carol? Solution Joan is 24 now let carol be x now when jone is x then carol is x/2 but 24-x =x-x/2(since the age difference is always is constant) ==> 24 =2x-(x)/2=3x/2 =>3x=48 =>x=16 so present age of carol is 16.