At what temperature on the Fahrenheit scale will the reading be double of the reading on the Celsius scale?

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340°F

240.6°F

330°F

320°F

answer is D.

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Detailed Solution

$F = ? Given that F = 2 C \Rightarrow C = \frac{F}{2}$
we have $\frac{C}{5} = \frac{F - 32}{9} \Rightarrow \frac{F / 2}{5} = \frac{F - 32}{9}$
$9 F = 10 F - 320 \Rightarrow F = 320^{\circ} F$

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