In what proportion should water and wine at Rs. 22·50 a

In what proportion should water and wine at Rs. 22·50 a liter be mixed to reduce the price to Rs. 18 a liter ?

Here ,Mean cost price Z = Rs.18
According to question , we have

Required proportion =	C₂ – Z
	Z – C₁

Required proportion =	20·50 – 18
	18 – 0

[Water worths Rs. 0 a litre]

Required proportion =	4·50	= 1 : 4.
	18