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Verified answer
Asas blackQkopi = Qsusu
mkopi . c. ΔTkopi = msusu .c. ΔTsusu
200 . (90-Tc) = 100 . (Tc-27)
2 . (90-Tc) = 1 . (Tc-27)
180 - 2Tc = Tc - 27
180 + 27 = Tc + 2Tc
207 = 3Tc
Tc = 69°C