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y -ilośc margaryny
x+y= 250
0,77x+0,82y= 0,8×250
x=250-y
0,77(250-y)= 0,8×250
192,5x-0,77y+0,82y=200
0,05y=7,5
y= 150
x= 100
Odp. Masło zawiera 100 gram margaryny
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