How did you get -40 degrees as the answer in the question what temperature does the Fahrenheit scale equal the Centigrade scale?

Answer 1

32 degrees Fahrenheit equals 0 degrees centigrade (or Celsius). 180 F degrees equal 100 C degrees (a ratio of 9/5). To convert from F to C, subtract 32 from the F temperature and multiply the answer by 5/9, then -400F = 5/9 (-40 - 32) = 5/9 x -72 = -40oC. To convert from C to F, multiply the C temperature by 9/5 and then add 32: -40oC = (9/5 x -40) + 32 = -72 + 32 = -40oF Any temperature can be converted by the same method: 100oC = (9/5 x 100) + 32 = 180 + 32 = 212oF and 212oF = 5/9 (212 - 32) = 5/9 x 180 = 100oC.