# Aptitude | Arithmetic Aptitude 3 | Question 2

At present father’s age is thrice of son’s age. After 15 years father’s age will be double of son’s age. What is son’s present age?**(A)** 16 years**(B)** 15 years**(C)** 12 years**(D)** 10 years**Answer:** **(B)****Explanation:**

Let the present age of son and father be x years and 3x years respectively. Then (3x + 15) = 2(x + 15) ∴ 3x + 15 = 2x + 30 ∴ x = 15 ∴ Son’s present age = x = 15 years.