a+b+c+d=100
Cate kg s-au consumat I zi?
100x1/4=200:4=25kg
cate kg s-au consumat II zi?
(100-25)x1/3=75:3=25kg
Cat s-a consumat III si IV zi?
100-25-25=50 kg
c+d=50
c=2xd/3
(2d/3+d)=50
(2d+3d)/3=50
5d=50x3
d=150/5
d=30 kg s-au consumat IV zi
Cat s=a consumat III zi?
50-30=20 kg