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15 caiete.......9 creioane.......26700lei / x4
si obtinem
60 .......105.......162000lei
60 ........36 .......106800lei
105-36= 69 creioane...........162000-106800=55200
adica 1 creion= 55200: 69= 800lei => 9 creioane=9x800=7200 =>
15 caiete= 26700-7200=19500
1 caiet = 19500: 15=1300
raspuns: 1 caiet=1300
1 creion=800