The ice point of an ungraduated mercury-in-glass thermometer is X, while its steam point is...

WAEC 1999

The ice point of an ungraduated mercury-in-glass thermometer is X, while its steam point is 90^o. This thermometer reads 60^o when the true temperature is 40^oC Calculate the value of X.

A. 60^o
B. 48^o
C. 40^o
D. 30^o

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Correct Answer: Option C

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