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m₁ . c₁ . Δt₁ = m₂ . c₂ . Δt₂
m₁ . c₁ . (tbenda₁ - takhir) = m₂ . c₂ . (takhir -tbenda₂)
0,02 kg . 4200 j/kg°c . ( 80°c-takhir) = 0,03 kg . 4200 j/kg°c . (takhir - 20°c)
6720J - 84t akhir = 126takhir - 2520 J
6720 J - 2520 J = 126 takhir + 84takhir
4200 J = 210 takhir
takhir = 4200 / 210
= 20° c
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