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Qberi = Qterima
m2 . C2 . (t2-tc) = m1 . C1 . (tc-t1)
4 . 4200 . (70-tc) = 1 . 4200. (tc-20)
280 - 4tc = tc - 20
280 + 20 = 4tc + tc
300 = 5tc
60 = tc
jadi, suhu campurannya adalah 60 derajat C.
catatan: m2, dan t2 diisikan dg angga yg terbesar yg diketahui