lalele + garoafe = 21
garoafe + trandafiri = 27
lalele + trandafiri = 24
_____________________
2 x ( lalele + garoafe + trandafiri) = 21 + 27 + 24 = 72
lalele + garoafe + trandafiri = 72 : 2 = 36 → flori in total
36 - 21 = 15 trandafiri
27 - 15 = 12 garoafe
24 - 15 = 9 lalele