A father said to his son, "I was as old as you are at present at the time of your birth." If the father's age is 38 years now, the son's age nine years back was?  Select:
A) 10yr  B) 15yr  C) 20yr  D) 25yr  E) 30yr
Let the son's present age be x years   Then, 38-x = x   x = 19   Son's age 9 years back = 19-9= 
<gadget id="calculator">19-9</gadget>
<output>10</output>
10 years   10yrnswer is 10yr
<result>A</result>
A father said to his son, "I was as old as you are at present at the time of your birth." If the father's age is 38 years now, the son's age nine years back was?