proxy.rb

#########
# PROXY #
#########

def fahrenheit_to_kelvin(value)                                                                                                                                    
  (value + 459.67) * 5 / 9                                                                                                                                         
end
 
def kelvin_to_celcius(value)                                                                                                                                       
  value -= 273.15                                                                                                                                                  
end 


###########
# REQUEST #
###########

def fahrenheit_to_celcius(value)
  in_kelvin = fahrenheit_to_kelvin(value)
  kelvin_to_celcius(in_kelvin)
end

I want to keep the original API and not have to pass an arguments to each instance method.