you have to define cold - i.e. if u consider cold to be less than 10 degrees then twice as cold would be -10 degrees... but as there is no definition of cold, there isn't really an answer?
The nature of centigrade is based on freezing and boiling point of water - it was correct to convert to fahrenheit, because what can you do with 0c? The answer is nothing, but it represents 32F, so twice as cold is 16F, and if you convert that to centigrade you get -8.8888 c. Easy.
i agree with jamian wheres the logic in converting to that? say for example, it is 0 farenhiet do you convert to celcius and divide by two??
Yeh,because the logic is you can't work with ZERO. For all units you can convert a ZERO number into another form and work it out that way. Only way it can be done.