Question

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 5 years back?

Answer 1

Heya User ...

--> Father's age = 'y'
--> Son's age     = 'x'

Acc. to question -->
 
[ Father's age minus Son's age -- Father's age when son was born ]
---> ( y - x ) = x   [ where x = son's present age ]
=> y = 2x

Father's present age = 36
=> Son's present age = 36 / 2 = 18

Hence, boy's age 5 yrs back = 13 √√