Three liquids are at temperatures of 13◦C, 22◦C, and 36◦C, respectively. Equal masses of the first two liquids are mixed, and the equi- librium temperature is 18◦C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 26.3◦C.
Find the equilibrium temperature when equal masses of the first and third are mixed.
Answer in units of ◦C.