Question: When a certain ideal glass thermometer is at room with a temperature of (25^{circ} mathrm{C}), the mercury level in the right arm is (245 mathrm{~mm})

When a certain ideal glass thermometer is at room with a temperature of $25^{\circ} \mathrm{C}$, the mercury level in the right arm is $245 \mathrm{~mm}$ above the reference mark. When the thermometer is then dipped into a saline solution, the mercury level drops by $25 \mathrm{~mm}$.

(a) What is the temperature of saline solution?

(b) Is your answer to part $a$ sufficient enough to solidify a certain type of oil with a freezing point of $2.77^{\circ} \mathrm{C}$ ?

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