The age of father 8 years ago was thrice the age of his son. Five years hence, father's age will be twice that of his son. The ratio of their present ages is:
Choose the correct choice from the following options: A) 47 : 11 B) 37 : 21 C) 27 : 21 D) 47 : 21 E) 47 : 31
Let the ages of father and son 8 years ago be 3x and x years respectively.   Then, (3x + 8) + 5 = 2[(x + 8) + 5]   3x + 13 = 2x + 26   x = 13.   Required ratio = (3x + 8) : (x + 8) = 47 : 21.   Answer: Option 47 : 21
<result>D</result>
The age of father 8 years ago was thrice the age of his son. Five years hence, father's age will be twice that of his son. The ratio of their present ages is: