3 years ago, Paula was 3 times as old as Karl. In 9 years, Paula will be twice as old as Karl. What is the sum of their ages now?
Choose the correct choice:  A) 42  B) 46  C) 50  D) 54  E) 58
P-3 = 3(K-3) and so P = 3K-6   P+9 = 2(K+9)   (3K-6)+9 = 2K+18   K = 15   P = 39   P+K = 54   The answer is 54.
<result>D</result>
3 years ago, Paula was 3 times as old as Karl. In 9 years, Paula will be twice as old as Karl. What is the sum of their ages now?