SOLUTION: A jeweler has 5 rings, each weighing 16 g, made of an alloy of 15% silver and 85% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 80%.
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Question 567512: A jeweler has 5 rings, each weighing 16 g, made of an alloy of 15% silver and 85% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 80%. How much silver should she add? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A jeweler has 5 rings, each weighing 16 g, made of an alloy of 15% silver and 85% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 80%. How much silver should she add?
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Equation:
silver + silver = silver
0.15*5*16 + 1*x = 0.20(80+x)
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Multiply thru by 100 to get:
15*80 + 100x = 20*80 + 20x
80x = 5*80
x = 5 grams of silver (amt. of silver to be added)
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Cheers,
Stan H.
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