Three liquids are at temperatures of 13°C, 19°C, and 40°C respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 15°C. Equal masses of the second and the third are then mixed, and the equilibrium temperature is 36.9°C. Find the equilibrium temperature when equal masses of the first and third are mixed.
Answer in units of °C.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.