Milk with water

How many liters of water are to be mixed in 12 liters of milk costing Rs 40 per liter so that it can be sold at Rs 32 per liter?

Correct answer:

x =  3 l

Step-by-step explanation:

V1=12 l c1=40 Rs/l c2=32 Rs/l  c1 V1 = c2   (V1+x) = const  c1 V1 = c2   V1 + c2   x  x=c2c1 V1c2 V1=3240 1232 12=3 l

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