How Much Gold How Much Gold
Moderate
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Our Favorite Trio has found a mysterious metal bar. This bar appears to be made of various metal including gold, iron, copper and tin. The bar does not contain any other metal except these. We do not know the quantity of each metal in the bar, but we do know the proportions of the various alloys. For example: the gold and tin proportion is 1/2, gold and iron -- 1/3, gold and copper -- 1/4. "the gold and tin proportion is 1/2" means that gold and tin together...

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