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intr-o cutie sunt bile rosii,albesi negre. din total 3/6 suntbile rosii,5/6 din rest sunt albel,iar 9suntnegre.cate bile sunt in cutie.metoda figurativa

Răspuns :

x*3/6=3x/6 rosi
(x-3x/6)*5/6=6x/6-3x/6*5/6=15x/36=5x/12 albe
9  negre
3x/6+5x/12+9=x
6x/12+5x/12+108/12=x
11x+108=12x
12x-11x=108
x=108
albe=5*108/12=45
rosi =3x/6=3*108/6=54
l------l 9
l------l------l------l------l------l   45
l------l------l------l-------l------l------l54