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Prin trei robinete curg in 4ore 10800 litri de apa.Cati litri de apa curg prin 5eobnete?(de acelasi timp cu primele) in 3ore

Răspuns :

4........10800 l
5........x
x=10800*5/4=54000/4=13500 l de apa
10800:3:4=900l/ora

900x5x313500litri curg di 5 rob in 3 ore