Math Ounces in gold

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Approximately 2,720,000 oz of gold went into the manufacturing of electronic equipment in a certain country in 1 year. This was 17% of all the gold mined in that country that year. How many ounces of gold were mined in that country that year?

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Consider using a simple proportion rule. 2.720.000 is to 17% just like ___ is to 100%