A father said his son , " I was as old as you are at present at the time of your birth. " If the father age is 40 now, the son age 5 years back was  Choose the correct choice from the following answers:	A) 14	B) 17	C) 15	D) 19	E) 99
Let the son's present age be x years .Then, (40 - x) = x x= 20.   Son's age 5 years back = (20 - 5)= 
<gadget id="calculator">(20 - 5)</gadget>
<output>15</output>
15 years   Answer: 15
<result>C</result>
A father said his son , " I was as old as you are at present at the time of your birth. " If the father age is 40 now, the son age 5 years back was