Raja is three times as old as Arun. Three years ago, he was four times as old as Arun. How old is Raja now?

Correct option is D

Let the present age of Arun be x years.

Since Raja is three times as old as Arun, Raja's present age will be 3x years.

Three years ago:

Arun's age was (x - 3) years.

Raja's age was (3x - 3) years.

According to the problem:

Three years ago, Raja was four times as old as Arun.

So, 3x - 3 = 4(x - 3)

Let's solve this equation:

3x - 3 = 4x - 12

Subtracting 3x from both sides:

-3 = x - 12

Adding 12 to both sides:

x = 9

So, Arun is 9 years old.

Raja's present age = 3x = 3 × 9 = 27 years