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m.c(air).∆T=m.L+m.c.∆T
100.1.(70-T)=50.80+50.1.(T-0)
7000-100T=4000+50T
3000=150T
T= 20°C
100 x 1 x 70-T = 50x80 + 50 x 1 x T
7000-100T=4000 + 50T
3000=150T
T=20 C