A commodity is made of two metals, A and B, which cost ₹35 per kg and ₹40 per kg, respectively, mixed in the ratio of 2 : 3. What is the total cost (in ₹) of 12 kilograms of this commodity?

Alloy A is formed by mixing iron (Fe) and nickel (Ni) in the ratio 3:4, while alloy B is formed by mixing Fe and Ni in the ratio 9:5. If equal quantities of alloys A and B are melted together to form a new alloy C, what will be the ratio of Fe to Ni in alloy C?

Two containers of equal capacity are each filled with a milk-water mixture. In the first container, the ratio of milk to water is 3:2, while in the second container the ratio is 4:1. If the contents of both containers are combined thoroughly in a larger vessel, what will be the resulting ratio of milk to water in the final mixture?