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Fahrenheit to Celsius

If the temperature drops by 18^o Fahrenheit in a given day, how much did it drop in degrees Celsius?

A. -14

B. 10

C. 32.4

D. -7.78

E. 25.2

To see the solution and images, visit the following link:
http://datquestionoftheday.com/math/fahrenheit-to-celsius/