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Puzzle | Blow hot and blow cold

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  • Difficulty Level : Basic
  • Last Updated : 18 Jan, 2023
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We know that 0°C is the same as 32°F. It is also a known fact that 100°C equals 212°F. But there is a temperature that gives the same reading on both Centigrade and Fahrenheit scales. Can you calculate this temperature?


The formula which gives the relationship between Centigrade and Fahrenheit is:

F = 9/5*C + 32
To find the temperature which is same in both Centigrade and Fahrenheit scales. We have to find out the value of C or F by replacing C with F or F with C. By going through this idea we have a new equation from the above equation:
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

Now we can say that at -40 temperature both Centigrade and Fahrenheit scales are same.


This article is contributed by Bishal Kumar Dubey. If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

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