Eighteen years ago, a father was three times as old as his son. Now the father is only twice as old his son. Then the sum of the present ages of the son and the father is:
Choose the correct choice from the following options
A) 54	B) 72	C) 105	D) 108	E) 118
Let the present ages of the father and son be 2x and x years respectively.   Then, (2x - 18) = 3(x - 18) =&gt; x = 36   Required sum = (2x + x) = 108 years.   ANSWER:108
<result>D</result>
Eighteen years ago, a father was three times as old as his son. Now the father is only twice as old his son. Then the sum of the present ages of the son and the father is: