The present ages of three persons are in the proportion of 4 : 7 : 9. Eight years ago, the sum of their ages was 36. Find their present ages.
Answers: A) 20,35,45 B) 8,20,28 C) 16,28,36 D) 12,21,27 E) None of these
Let the present ages of three persons be 4K,7K and 9K respectively.   (4K - 8) + (7K - 8) + (9K - 8) = 36   20K = 60   K = 3   Therefore, then present ages are 12,21,27.   ANSWER:12,21,27
<result>D</result>
The present ages of three persons are in the proportion of 4 : 7 : 9. Eight years ago, the sum of their ages was 36. Find their present ages.