Do not think temperature is linear to the amount of energy stored.
Last time I checked, temperature was linear with the average kinetic energy of the molecles in a substance. In fact, I was taught temperature IS a measure of the average (mean) kinetic energy of the molecules in a substance. The amount of mass the substance has would then determine the "total energy stored".
Obviously you have reference either Kelvin or Rankin, as TheOddOne pointed out.
I might be wrong though.... GCSE physics was a LONG time back
I agree that the question is very ambiguous. As a meteorologist, I've never heard of the temperature being described as "twice as warm/cold"...
regards,
palgia