BrainDrain added a post in a topic Think about these
"If the temperature this morning is 0 degrees and the Weather Channel says, "it will be twice as cold tomorrow", what will the temperature be?"
I know what you're thinking: The answer is 2 times 0 which is, of course, 0. And that would be a paradox. But the real answer lies in knowing what the temperature dropped to 0 from.
What was the temperature yesterday? If it was +20 degrees and went to 0 today, then the temperature dropped 20 degrees. Twice that is 40 degrees, meaning tomorrow's temperature will be -40 degrees.
Let X represent yesterday's temperature. Let Y equal tomorrow's temperature.
X - X = 0
0 - 2X = Y
Nope, no paradox here. Just an incomplete formula. And it doesn't matter whether it's Celsius or Farenheit.