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z=5*b
k=b+120
5*b+b+120+b=1800
7b+120=1800
7b=1680/7
b=240kg
z=5*b=5*240=1200kg
k=360
240+1200+360=1800 kg :)
buraki=x
ziemniaki=5x
kapusta=120kg+x
x+5x+120+x=1800
7x=1680/7
x=240kg
buraków było 240kg
ziemniaków było 1200kg
kapusty było 360kg
y= ziemniaki czyli 5x
z= kapusta czyli 120 + x
x+5x+120+x = 1800
7x=1800- 120
7x= 1680 / : 7
x= 240
buraki = 240 kg
ziemniaki = 5*240= 1200 kg
kapusta = 120 + 240= 360 kg