A father tells his son, "I was of your present age when you were born". If the father is 36 now, how old was the boy five years back ?	Pick.
A) 13
B) 15
C) 17
D) 20
E) 25
Explanation:   Let the father's age be x and the son's age be y.   Then, x - y = y or x = 2y,   Now, x = 36. So, 2y = 36 or y = 18.   Therefore Son's present age = 18 years.   So, son's age 5 years ago = 13 years.   13nswer: Option 13
<result>A</result>
A father tells his son, "I was of your present age when you were born". If the father is 36 now, how old was the boy five years back ?