I've got this one :-)
If it's zero degrees Fahrenheit, that equals -17.78 degrees celcius.
So twice as cold would be -36.56 degrees celcius.
If you really want to get technical then, convert -36.57 degrees celcius back into Fahrenheit, it's actually about the same... -36.5 degrees farenheit..
So the answer is 36.5 whichever way you look at it..
Unless the original ZERO temperature was in celcius - Which would equal 32 degrees Fahrenheit... Half that and you get 16 degrees Fahrenheit..
Convert that back to degrees Celcius and you get -8.89 degrees..
Wow, you can take your pick there... But I figured it out..
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