Five years ago a father was thrice as old as his son. Five years hence the son will only half the age of his father. Find their present ages.  Options.
A) 25, 25  B) 35, 15  C) 15, 35  D) 15, 35  E) 10, 40
Explanation:   Let the present ages of father,and son be 'a' and 'b' respectively.   a - 5= 3(b-5) =&gt;a-3 b =-10 --------(1)   a-2b =5 ------------(2) solving (1) and (2), we get b =15   Substituting b = 15 in second equation,   we get a=35   Answer: 35, 15
<result>B</result>
Five years ago a father was thrice as old as his son. Five years hence the son will only half the age of his father. Find their present ages.