The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 56. Find their present ages.
Choose the correct answer
A) 16, 28, 38  B) 16, 28, 36  C) 16, 28, 32  D) 16, 28, 30  E) 16, 28, 31
Let their present ages be 4x, 7x and 9x years respectively.   Then, (4x - 8) + (7x - 8) + (9x - 8) = 56   20x = 80 =&gt; x = 4   Their present ages are 16, 28 and 36 years respectively.   Answer: 16, 28, 36
<result>B</result>
The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 56. Find their present ages.