A confectioner sells the milk after mixing some water in it at the same rate at which he bought. If he gains 25 % in this way, the quantity of watey mixed with per litre of milk

The answer is 4 : 1 (Ratio of Milk to Water)

Step-by-step explanation:

Let cost price of the 1 litre of milk be X

selling price to be X + 25% of X

cost price = 100/125

= 4/5

;. ratio of milk to water = 4/5 : 1/5 = 4 : 1

therefore, for every 4 litres of milk, one litre of water is added.