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Posted by on Thursday, October 4, 2012 at 12:18am.

Joe has a ring weighing 16 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 69% . How many grams of silver should he add?

  • Physics(class) /Math (problem) - , Thursday, October 4, 2012 at 10:29am

    considering just the mass of the silver,

    (.20)(16)+x = (.31)(16+x)
    x =2.55

    so, add 2.55g of silver

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