arithmetic - five years ago mr arvind was thrice as old as his son and ten years hence he will be twice as old as his son mr arvinds present age in years is - skillgun

Let Mr. Arvind’s age (in years) = x and his son’s age = y
Then, x – 5 = 3(y – 5) i.e. x – 3y + 10 = 0
And, x + 10 = 2 (y + 10) i.e. x – 2y – 10 = 0
Solving the two equations, we get
x = 50, y = 20.