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October 22nd, 2009, 08:38 AM   #1
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What mean s 'negative number is five times bigger'?

Hi!

I got such a case:

In january medium temp is -10 F, in july it's five times bigger than in january.
What is the medium temperature in july?

Of course 5(times) x -5 (temperature) gives -25, but -25 is NOT bigger than -5. So, perhaps it should be (+)25.
Correct or not?

IF it is (+)25 so should it be -5 (temp in january) +25=20 OR 0 (as a starting point for calculation) + 25=25 as medium temp in july?


Thank you in advance

W
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October 22nd, 2009, 09:24 AM   #2
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Re: What mean s 'negative number is five times bigger'?

Hint: Where do you live that it might be a negative reading in July? Although not in context, common sense would assume that they are talking about absolute value differences.
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October 22nd, 2009, 10:11 AM   #3
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Re: What mean s 'negative number is five times bigger'?

Quote:
Originally Posted by David
Hint: Where do you live that it might be a negative reading in July? Although not in context, common sense would assume that they are talking about absolute value differences.
Dear David

Thanks for your remark, it is what I mentioned that even mathematically -25 is NOT bigger than -5. Anyway the point is what means five times bigger when we talk about negative numbers. But is there mathematical rule/theorem it should be as we suggest from common sense. It is mathematical, not logical problem.

The second issue is if it should be added to -5 or to zero, as reference level.
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