O gaina o rata si o gisca au in total
45 de pui rata ara cu 5 pui mai multi decit gisca iar gaina are de 2 ori mai
multi pui decit gisca citi pui are gisca
I--------I 5 I pui
rata
I--------I
pui gasca
I--------II--------I pui gaina
in total 45
45-5=40
40:4=10 pui gasca
10+5=15 pui rata
10*2=20 pui gaina
ecuatii
a=pui rata
b=pui gasca
c=gaina
a-5=b
c=2b =2(a-5)=2a-10
a+b+c=45
a+a-5+2a-10=45
4a=60
a=15 pui rata
b=15-5=10 pui gasca
c=10*2=20 pui gaina