A father is now three times as old as his son. NINE years back, he was four times as old as his son. The age of the son (in years) is
Select.
A) 12  B) 15  C) 18  D) 20  E) 27
If father's age is F and son's age is S, then   F=3S   and   F-9 = 4*(S-9)   3S-9 =4S-36   S=27   F=81 years   ANSW27R:27
<result>E</result>
A father is now three times as old as his son. NINE years back, he was four times as old as his son. The age of the son (in years) is