At what temperature do the Celsius and Fahrenheit scales read the same?
A) 40°
B) - 40°
C) 11.4°
D) - 11.4°
E) There is no temperature at which the two scales read the same.

Question

Quizplus · Accepted Answer

To convert Celsius to Fahrenheit: 
F = 9/5C + 32
To find when they are the same: 
C = F 
So we can substitute F for C: 
F = 9/5F + 32 
Solving for F: 
F = -40 
Therefore, at -40 degrees, Celsius and Fahrenheit scales read the same.

At What Temperature Do the Celsius and Fahrenheit Scales Read