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un bazin se umple prin 5 robinete in 15 ore .in cat timp nr umple acelias bazin 3 din cele 5 robinete?????????????????????????????

Răspuns :

5 r--------------- 15 ore
3r--------------------- x ore

x=15x5 :3=75:3=25 ore
5 r.................15h
3 r.................. xh

x=15·5/3=75/3=25h