Kartik’s father age is four times the age of Kartik. Three years ago, Kartik’s father age was seven times the age of Kartik. The present age of Kartik is:

6 years

Let Kartik's present age = x

So Present age of kartik's father = 4x

Here,

Three years ago Kartik's age = x - 3

Three years ago kartik's father age = 4x - 3

ATQ,

4x - 3 = 7 (x - 3)

     3x = 18

       x = 6

Hence, Present age of kartik is 6 years.