The temperature which has the same reading on both Fahrenheit

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The temperature which has the same reading on both Fahrenheit and Celsius scales is

1. 40°
2. –40°
3. –34°
4. –140°

Correct Option: B

If C is the temperature in Celsius and F is the
temperature in Fahrenheit then,

	C	=	F - 32
	S		9

They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.