SOLUTION: How much pure gold should be mixed with 12 karat gold to obtain 72 grams of 18 karat gold?

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Question 335423: How much pure gold should be mixed with 12 karat gold to obtain 72 grams of 18 karat gold?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Pure gold is 24 karat.
18 is the midpoint between 12 & 24, so equal amounts.
36 grams of each