mATH QUESTION? HELP NEEDED?

You see 10 sacks of gold coins in a row.Actually,only one sack contains true gold coins;the other 9 sacks are counterfeit.Their coins are gold plated, and look the same,but are almost worthless.You must identify the sack of pure gold coins.A pure gold coins weighs 2 ounces,while a gold plated copper coin weighs 1 ounce.You have a scale and are permitted on weighing.How can you find the sack of gold coins with just one weighing

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