WHEN ARE CELSIUS AND FAHRENHEIT THE SAME?
 
METEOROLOGIST JEFF HABY
The formula conversion between Fahrenheit and Celsius is given below:
F = 9/5*C + 32
To find the temperature both scales are equal we can use another equation and combine it with this previous equation.
The equation is simply F = C. Plug in for F or C and solve. Both cases are shown below:
C = 9/5*C + 32
C  9/5*C = 32
4/5*C = 32
C = (32*5)/4 = 40
F = 9/5*F + 32
F  9/5*F = 32
4/5*F = 32
F = (32*5)/4 = 40
Thus, at the cold temperature of negative 40, this temperature is the same on both the Fahrenheit and Celsius
temperature scales.
Temperature conversion page: http://www.theweatherprediction.com/basic/conversions/


