A thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380 mmHg is
-25oC
-20oC
20oC
25oC
Correct answer is A
\(\frac{440 - 380}{680 - 380} = \frac{0 - x}{100 - x}\) = -25oC
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