Sum of two numbers is thrice their difference. Their ratio

Let the numbers be x and y.
According to the question,
x + y = 3(x – y)
⇒ x + y = 3x – 3y
⇒ 3x – x = y + 3y
⇒ 2x = 4y
⇒ x = 2y

⇒	x	=	2
	y		1