intr-o cutie sunt baloane astfel- albe a cincea parte din total si inca 10,-galbene a treia parte din rest si inca 10,-rosii restul de 50.Afla numarul total al baloanelor
notam a nr de baloane albe 1/5*x+10 galbene 1/3* (x-1/5*x-10)+10 rosii-restul de 50 50+1/3(4/5 x -10)+10+1/5*x+10=x 70+1/3*(4/5*x-10)+1/5*x=x 70+(4/5*x-10)/3=4/5x /*3 210+4/5*x-10=12/5*x 200+4/5x=12/5*x /*5 1000+4x=12x x=125
