حل المسالة دى ارجوكم

[wail_poet]

Qgained = Qlost
mc(t-20)= mc(100-t)
C is equal so it is ereased from both sides
50(t-20) = 150 ( 100 - t)
t- 20 = 300 - 3t
4 t = 320
t= 80 OC

Mr./Walid 01004104024