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 \(2.77^{\circ} \mathrm{C}\) ?