Difficult
$925$ fine silver means an alloy of :
- A$7.5\% \, Ag$ and $92.5\% \, Cu$
- B$92.5\% \, Ag$ and $7.5\% \, Cu$
- C$80\% \, Ag$ and $20\% \, Cu$
- D$90\% \, Ag$ and $10\% \, Cu$
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