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QUESTION
Joe has a ring weighing 20 grams made of an alloy of 20 \% silver and the rest gold. He decides to melt down the rings and add enough silver to...
Joe has a ring weighing 20 grams made of an alloy of 20 % silver and the rest gold. He decides to melt down the rings and add enough silver to reduce the gold content to 73 %. How many grams of silver should he add?
