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doua robinete pot umple un bazin in 4,6 ore.Dar 12 robinete in cat timp pot umple un bazin

Răspuns :

2 robinete.......4.6 ore
12 robinete ......x

Folosim regula de 3 simpla!
2 supra 12 = x supra 4.6
x=2*4.6 :12=9.2:12=0,7(6)

in 0.7(6) ore

Sper ca e bine! xD


2robinete............ 4,6 h
12 robinete............. x h

x=2·4,6/12=46/60=23/30=0,7666....=0,7(6)