Q. Pure milk costs Rs. 16/- per liter. After adding water the milkman sells the mixture @ Rs. 15/- per liter and thereby makes a profit of 25% in what respective ratio does he mix milk with water?
A) 3 : 1
B) 4 : 3
C) 3 : 2
D) 5 : 3
E) 4 : 1
If SP of mixture is 15/- per liter and profit is 25%, then CP of mixture = (100/125) * 15 = 12/- liter As 16/- is the cost of pure 1000 ml, therefore, for 12/-, the quantity of milk = (12/16) * 1000 = 750 ml So for 12/- per liter, the milk is 750 ml, then water will be 250 ml. Thus, required ratio = 750:250 = 3:1