A father was as old as his son's present at the time of your birth. If the father's age is 42 years now, the son's age 5years back was?  Choose the correct choice from the following answers:  A) 10 years  B) 12 years  C) 14 years  D) 16 years  E) 20 years
Let the son's present age be x years. Then, (42 - x) = x   2x = 42.   x = 21.   Son's age 5 years back (21 - 5)= 
<gadget id="calculator">(21 - 5)</gadget>
<output>16</output>
16 years.   16 years
<result>D</result>
A father was as old as his son's present at the time of your birth. If the father's age is 42 years now, the son's age 5years back was?