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15 robinete pot umple un bazin in 4 ore.Aflati in cat timp pot umple bazinul 10 robinete

Răspuns :

15r...............4h 10r...............xh X=(15•4):10=6ore
Acesta ese o problema in care folosim metoda direct proportionata(d.p):

15robinete............4ore  d.p
10robinete............xore
Rezolvare: x=(15x4) :10