The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 136. Find their present ages.
Select the correct option:  A) 20, 28  B) 28, 36  C) 35, 45  D) 56, 72  E) of these
Let their present ages be 4x, 7x and 9x years respectively.   Then, (4x - 8) + (7x - 8) + (9x - 8) = 136   20x = 160 =&gt; x = 8   Their present ages are 32, 56 and 72 years respectively.   ANSWER:56, 72
<result>D</result>
The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 136. Find their present ages.