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un robinet umple un bazin de 1000 litri in 40 de minute in cite minute vor unple bazinul

a)4 robinete
b)6 robinete


ajutatima varog


Răspuns :

1 robinet .... 40 minute
4 robinete.....x minute
6 robinete.....y minute

1/4=x/40⇒ 4x=40⇒x=40:4=10 minute
1/6 = y/40⇒ 6y=40⇒ y=40/6=20/3= 6,(6) ≈ 6 minute si 35 secunde