A father is now three times as old as his son. Four years back, he was four times as old as his son. The age of the son (in years) is Pick one:	A) 12	B) 15	C) 18	D) 20	E) 25
If father's age is F and son's age is S, then   F=3S   and   F-4 = 4*(S-4)   3S-4 =4S-16   S=12   F=36 years   12NSWER:12
<result>A</result>
A father is now three times as old as his son. Four years back, he was four times as old as his son. The age of the son (in years) is