Question

intr-o cutie sunt baloane astfel:albe-a cincea parte din nr total si inca 10; galbene- a treia parte din rest si inca 10, rosii- restul de 50

Answer 1

notam x nr de baloane total
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
8x=1000
x=125