Răspunsuri

2014-01-12T14:16:26+02:00
Primul elev :a=b+35
Al doilea elev :b
Al treilea elev:c=b+45
 a+b+c=200 timbre
(b+35)+b+(b+45)=200
3b+80=200     3b=200-80     3b=120 timbre
b=120/3       b=40 timbre
Deci al doilea are 40 timbre
a=b+35      deci primul are a=40+35=75 timbre
Al treilea are c=b+45    c= 40+45    c=85 timbre

Proba   a+b+c=75+40+85=200 timbre

Succes!!!
2014-01-12T18:15:38+02:00
35+45=80 ;  200-80=120;  120:3=40 timbre al 2 copil; 40+35=75 primul copil; 40+45=85 al 3 copil