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y - ilość margaryny
x+y=250
0,77x+0,82y=0,8*250
x=250-y
0,77(250-y)+0,82y=200
192,5-0,77y+0,82=200
0,05y=7,5
y=150
x=250-150
x=100
odp: Margasło zawiera 100g masła.