baloane albe=80
baloane rosii=80*2 =>baloane rosii=160
baloane verzi=(baloane albe+baloane rosii)/2 => (80+160)/2
baloane verzi=120
baloane albe+baloane rosii+baloane verzi=80+160+120=360
360:10=36 de baloane sunt intr-o ghirlanda
36:3=12 baloane de fiecare fel sunt intr-o ghirlanda