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T kopi = 90°C
m susu = 20 g
T susu = 5°C
Qlepas = Qterima
m×ΔT = m×ΔT
230×(Tkopi-Tc) = 20×(Tc-Tsusu)
230×(90-Tc) = 20×(Tc-5)
20700-230Tc = 20Tc-100
20700+100 = 20Tc+230Tc
20800 = 250Tc
20800/250 = Tc
83,2°C = Tc
Tc = suhu akhir campuran