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żelazo 6% - 100-x
żelazo 5% - 100
0,04x+0,06(100-x)=0,05*100
0,04x+6-0,06x=5
-0,02x=-1 |:(-0,02)
x=50
żelazo 4% - 50kg
żelazo 6% - 50kg