in trei hoteluri s_au cazat 989 de turisti. in primele doua hoteluri s_au cazat 676 de turisti, iar in ultimele doua 584 de turisti. Cati turisti s_au cazat in fiecare hotel.
I+II+III=989 I+II=676 II+III=584 1.Cati turisti s au cazat in al treilea hotel? 989-676=313 2.Dar in primul? 989-584=405 3.Dar in al doilea? 676-405=271 verificare: 271+405+313=989
