
Sanjay S. answered 01/14/15
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Natalie,
Total weight of alloy is 67 + 20 = 87 g
67 g of which is gold
So % gold is 67/87* 100 = 77.01%

Sanjay S.
You are welcome and good luck.
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01/14/15
Natalie C.
01/14/15