Which is the correct formula expressing relationship between Fahrenheit 'F' and Celsius 'C' temperature scales?

CONCEPT:Temperature: It is the measure of the degree of hotness and coldness of a body.The SI unit of temperature is Kelvin (K).The various temperature scales commonly used are Celsius (C), Kelvin (K), Fahrenheit (F), and Rankine (Ra).Celsius: It has 100 degrees between the freezing and boiling points of water. Here 0° represents the freezing point and 100° represents the boiling point. In many countries, celsius is used to communicate DAY to day temperatures.Fahrenheit: The Fahrenheit SCALE was proposed by PHYSICIST Daniel Gabriel Fahrenheit in 1724. This scale is PRIMARILY used in the United States and some Caribbean countries to communicate day to day temperatures.The temperature T in degrees Fahrenheit (°F) is equal to the temperature T in degrees Celsius (°C) times 9/5 plus 32:\(°F={{9\over5}°C+32}\)CALCULATION:Since \(°F={{9\over5}°C+32}\)F - 32 = 9C/5(F - 32)/9 = C/5Multiply with 1/20 on both sides,(F - ­32) / 180 = C / 100So option 3 is correct.