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5x- ziemniaki
120 +x - kapusta
x+5x+120+x= 1800
7x=1680
x=240 - buraki
5 *240 = 1200 - ziemniaki
120 + 240 = 360 - kapusta
5x - liczba ziemniaków
120kg + x - liczba kapusty
x+5x+120kg+x=1800kg /-120kg
x+5x+x=1680kg
7x=1680kg //7
x=240 kg
5x= 5*240kg= 1200kg
120kg+240kg= 360kg
odp. Buraków zebrano 240 kg, ziemniaków zebrano 1200kg, a kapusty zebrano 360kg.