On a backpacking trip through Europe, Troy spent 20 Swiss francs to stay one night in a youth hostel. If the foreign exchange rate between the U.S. dollar and the Swiss franc is 1:2.2, how much did Troy spend in U.S. dollars?

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By the way, the proportion could also be written
\[\frac{1}{2.2} = \frac{x}{20}\]

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