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4 ratusti si 5 bobocei cinatresc impreuna 4 kg 100g,iar 5 ratusti si 4 bobocei cintaresc 4kg.Cit cintareste o ratusca?

Răspuns :

4r+5b=4100
5r+4b=4000
9r+9b=8100
r+b=900
4r+4b=3600
b=500
r=400 grame are o ratusca :)