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Three liquids are at temperatures of 4 ◦C,
21◦C, and 31◦C, respectively. Equal masses
of the first two liquids are mixed, and the
equilibrium temperature is 6◦C. Equal masses
of the second and third are then mixed, and
the equilibrium temperature is 28◦C.
Find the equilibrium temperature when
equal masses of the first and third are mixed.
Answer in units of ◦C.



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