An alloy weighing $80$ kg contains copper and tin in the ratio $7 : 3$. How much tin (in kg) must be added to this alloy so that the ratio of copper to tin becomes $2 : 1$?

Options:

• A: $4$ kg
• B: $5$ kg
• C: $6$ kg
• D: $8$ kg

Related Practice Questions:

• Which of the following artifacts, extensively found at Burzahom and Gufkral, specifically indicates that the Neolithic inhabitants of Kashmir practiced sewing animal skins for clothing to survive the harsh winters?
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