At what temperature do Celsius and Fahrenheit scales have the same value?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. -40ºc.
The Celsius and Fahrenheit scales have the same value at minus 40 degrees. This means that -40 degrees Celsius is equal to -40 degrees Fahrenheit. To find this, you use the conversion formula from Celsius to Fahrenheit: multiply the Celsius temperature by 9/5 and then add 32. Setting the Celsius value equal to the Fahrenheit value and solving the equation gives -40 degrees. This is the only temperature where both scales show the same number, even though their units are different. It’s a unique point where the two temperature scales intersect.