The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 36. Find their present ages.	Select.
A) 20, 28
B) 21, 27
C) 35, 45
D) 35, 55
E) of these
Let their present ages be 4x, 7x and 9x years respectively.   Then, (4x - 8) + (7x - 8) + (9x - 8) = 36   20x = 60 =&gt; x = 3   Their present ages are 12, 21 and 27 years respectively.   ANSWER:21, 27
<result>B</result>
The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 36. Find their present ages.