At what temperature do Celsius and Fahrenheit scales coincide?

-30 degrees

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-40 degrees

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-20 degrees

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-10 degrees

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Solution

The correct option is B -40 degrees
Using temperature scale conversions,
$C = \frac{5}{9} (F - 32)$
Given, $C = F$
$⟹ C = \frac{5}{9} (C - 32)$
$C = - 40$

$∴ - 40^{\circ} C = - 40^{\circ} F$

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At what temperature is the Celsius and Fahrenheit equal, if the relation between Celsius and Fahrenheit is
$\frac{F - 32}{9} = \frac{C}{5}$

What is the equivalent temperature of 0 degree Celsius in Fahrenheit scale?

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