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The lower and upper fixed points of a mercury-in-glass th...

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 is C

No explanation has been provided for this answer.