The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60^oC the height would be

7.5cm

9cm

10.8cm

12cm

12.6cm

Correct answer is D

18cm .... 100^oC

x .... 60^oC

3cm .... 0^oC

\(\frac{x - 3}{18 - 3}\) = \(\frac{60 - 0}{100 - 0}\)

= 12cm

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The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60oC the height would be