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METEOROLOGIST JEFF HABY. F = 9/5*C + 32. To find the temperature both scales are equal we can use another equation and combine it with this previous equation. The equation is simply F = C. Plug in for F or C and solve. C = 9/5*C + 32. -4/5*C = 32. F = 9/5*F + 32. -4/5*F = 32. Thus, at the cold temperature of negative 40, this temperature is the same on both the Fahrenheit and Celsius temperature scales.
Celsius to Fahrenheit: Â°C Ã 1.8 + 32 = Â°F. Fahrenheit to Celsius: (Â°F â 32) / 1.8 = Â°C. To make Ã1.8 easier we can multiply by 2 and subtract 10% , but it only works for Â°C to Â°F: Celsius to Fahrenheit: (Â°C Ã 2) less 10% + 32 = Â°F.hey both measure the same thing (temperature!), but use different numbers: 1  Boiling water (at normal pressure) measures 100Â° in Celsius, but 212Â° in Fahrenheit.