In what ratio is water to be mixed with milk at Rs. 9.60 per litre to make the price of the mixture Rs. 9 per litre?
Assume that cost of water is 0
Let quantity of water be y litre.
and quantity of milk be x litre.
∴ Quantity of mixture will be (x+y) litre and the given cost of the mixture Rs. 9 per litre.