If 30% of (B – A) = 18% of (B + A), then the ratio A :

Given that , 30% of (B – A) = 18% of (B + A)

(B – A) ×	30	= (B + A) ×	18
	100		100

∴	B - A	=	18	=	3
	B + A		30		5

By componendo and dividendo,

	2B	=	3 + 5
	-2A		3 - 5

=	8	=	4
	-2		-1

⇒	B	=	4
	A		1

⇒ A : B = 1 : 4