The formula $${F}={9}\frac{C}{5}+{32}$$ gives the relationship between the temperature in degrees Fahrenheit, F, and the temperature given in degrees Celsius, C. If the temperature is 85 degrees Fahrenheit, what is the temperature, to the nearest degree, in degrees Celsius?
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A18°C
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B23°C
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C29°C
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D47°C
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E51°C
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正确答案: C