The present ages of three persons in proportions 4 : 7 : 8. Eight years ago, the sum of their ages was 71. Find their present ages (in years).
Choose the correct choice from the following.
A) 15, 20, 28
B) 24, 28, 36
C) 20, 35, 40
D) 33,42,43
E) of these
Let their present ages be 4x, 7x and 8x years respectively.   Then, (4x - 8) + (7x - 8) + (8x - 8) = 71   19x = 95   x = 5.   Their present ages are 4x = 20 years, 7x = 35 years and 8x = 40 years respectively.   ANSWER:20, 35, 40
<result>C</result>
The present ages of three persons in proportions 4 : 7 : 8. Eight years ago, the sum of their ages was 71. Find their present ages (in years).