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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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