A father is now three times as old as his son. Six years back, he was four times as old as his son. The age of the son (in years) is	Select
A) A)12	B) B)15	C) C)19	D) D)20	E) E)22
Explanation:   Let son's age be x years. Then, father's age = (3x) years.   Six years ago, father's age = (3x -6 ) years and son's age = (x - 6) years.   So, 3x - 6 = 4 (x - 6)=&gt; 3x - 5 = 4x - 24=&gt; x = 19.   Answer: 19
<result>C</result>
A father is now three times as old as his son. Six years back, he was four times as old as his son. The age of the son (in years) is