Question

Mr sharma is twice as old as his son after 4 years, he will be four times as old as his son was 9 year ago. How old are they both now?

Answer 1

Let,
the Mr.sharma's age = x
     Mr.Sharma son's = y
according to the question,
x +4  = 2y..........(1)
x = 4(y-9)
sub x in  (1),
we get, 4(y-9) + 4 = 2y
             4y - 36+ 4 = 2y 
             4y-2y = 36 - 4
             2y = 32
               y = 16
therefore , son's age = 16
                 Mr.sharma's age = 4( 16-9) = 4( 7) = 28