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6kg - x / 245
8kg - x+10 / 245+10=255
x+(x+10)=500
2x+10=500
2x=500-10
2x=490 | :2
x=245
255+245=500
245:6≈41
255:8≈32
Paczek lżejszych było ok. 41, a cięższych ok.32