# A thermometer which has upper fixed points and lower fixed points equal to $\;95^{0}\;$ and $\;5^{0}\;$ respectively , reads $\;59^{0}\;$. What is the temperature on the centigrade scale .
$(a)\;60^{0}C\qquad(b)\;30^{0}C\qquad(c)\;90^{0}C\qquad(d)\;15^{0}C$