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Daca 4 robunete umplu un bazin in 5 ore , atunci in cat timp va umple bazinul 6 astfel de robinete ?


Răspuns :

3h si 40minute, deoarece 4x5=6x(X)
20=6x
x=20:6
x=3,(6) sau 3h 40 min
4r...........i.p.......5h
6r........................x h

[tex]\dfrac{4}{6}[/tex]= [tex]\dfrac{x}{5}[/tex]

x= [tex]\dfrac{4\cdot 5}{6}[/tex]= [tex]\dfrac{2\cdot 5}{3}[/tex]= [tex]\dfrac{10}{3}[/tex]=3 h 33 min