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20dag = 0,2kg
2.5 kg+ 0,8kg+0.2kg=3.5kg
5kg - 3,5kg= 1,5kg
2,5 x 4/5 = 2 kg
20 dag = 0,2 kg
5 kg - (2,5 kg + 2 kg + 0,2 kg) = 5 kg - 4,7 kg = 0,3 kg
0,3 kg = 30 dag
Odp. Śliwki ważyły 30 dag.