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Daca 2 robinete umpleun bazin in 2020 minuteau unul il umple in 30 de minute.In cat timp il umple celalalt robinet???

Răspuns :

30 de minute ? adik , asa mi se pare logic ..
Regula de 3 simpla:
2 robinete ----------- 20 minute
x robinete ----------- 30 minute

x=2•30/20
x=60/20
x=3

3 robinete umple bazinul in 30 minute

Bafta!