The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?
A.
6.0mm
B.
18.0mm
C.
30.0mm
D.
60.0mm
E.
120.0mm
Correct Answer: Option C
Explanation
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