a)
inaltime fereastra 200-80=120 cm=1,2 m
latime fereastra 120 cm=1,2 m
Afereastra=1,2×1,2=1,44 m²
inaltime usa= 200 cm=2m
arie usa = 2x
Aperete=7×3=21 m²
Arie de zugravit=21-1,44-2x=19,56-2x
b) x=1,8/2=0,9 m
c)
Arie de zugravit=21-1,44-2x=19,56-1,8=17,76 m²
5 m²........1 litru vopsea
17,76..........x litri
x=17,76/5=3,552 litri vopsea
