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4 butelki i 2 słoiki = 6kg
6kg : 6 = 1kg
1 butelka waży 1 kg
3b+2s=2b+3s
4b+2s=6kg
3b-2b+2s-3s=0
4b+2s=6
b-s=0 /*2
4b+2s=6
2b-2s=0
4b+2s=6
6b=6 /:6
b=1kg
Odp.Butelka wazy 1kg.