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2014-11-13T19:52:22+02:00
C=10%
md =20
ms = md*100/c
ms= 20*100/10 = 200 g
ms-md=m apa
m apa= 180g
apoi c=20% 
md= 20 g
ms =?
c=md*100/(md+ m apa)
20= 20*100/ (20 +m apa)
20 *(20 + m apa) = 20 *100
20 + m apa= 100
m apa = 80 g
din m apa 1 scadem m apa 2
si aflam cata trebuie evaporata
m apa 1=180
m apa 2=80
m apa evaporata = 180-80=100
2 5 2