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10min=600sekund
600s : 20s = 30s
30s * 7 = 210torebek
Odp: Pani Ania w czasie 10min zapakuje najwięcej 210 torebek.
10 min = 10*60 sek=600 sek
600:20=30
30*7 = 210 - najwięcej torebek