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3 robinete deschise pot umple un bazin in 12 ore. In cat timp vor umple bazinul 4 robinete cu aceelasi debit urgent !!

Răspuns :

3 robinete  .........12 h
4  "   "     .............x

3/4 =x/12
x =3*12/4 =36/4 = 9 h
3r.....................12h
4r.......................xh

x=3x12/4=36/4=9h