After 12 years, I shall be 3 times as old as I was 4 years ago. Find my present age.

Let my present age be x years. According to question, after 12 years, I shall be 3 times as old as I was 4 years ago. ⇒ (present age + 12 years) = 3(present age - 4 years) ⇒ (x + 12) = 3(x - 4) ⇒ x + 12 = 3x - 12 ⇒ 3x - x = 12 + 12 ⇒ 2x = 24 ⇒ x = ⇒ x = 12 Hence, my present age is 12 years.