Joe has a ring weighing 20 grams made of an alloy of 19 percent silver and the rest gold. He decides to melt down the rings and add enough silver to…

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Joe has a ring weighing 20 grams made of an alloy of 19 percent silver and the rest gold. He decides to melt down the rings and add enough silver to reduce the gold content to 73 percent. How many grams of silver should he add?