Răspuns :
1) Metoda figurativa
f |............|............|............|
b|............|
28:4=7 baieti si 28-7=21 fete
2) Metoda algebrica
f=3b
3b+b=2
4b=28
b=7
f=21
f |............|............|............|
b|............|
28:4=7 baieti si 28-7=21 fete
2) Metoda algebrica
f=3b
3b+b=2
4b=28
b=7
f=21