Joe has a ring weighing 19 grams made of an alloy of 15 silver and the rest gold. He decides to melt down the rings and add enough silver to reduce…

Joe has a ring weighing 19 grams made of an alloy of 15 silver and the rest gold. He decides to melt down the rings and add enough silver to reduce the gold content to 69 . How many grams of silver should he add?

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