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10 robinete cu acelasi debit pot umple un bazin in 12 ore.30 de robinete vor putea umple bazinul in .. ore

Răspuns :

[tex]10 \: robinete \: ..... \: 12 \: ore[/tex]

[tex]30 \: robinete \: ..... \: x \: ore[/tex]

[tex] \frac{10}{30} = \frac{x}{12} [/tex]

[tex]x = \frac{10 \times 12}{30} = \frac{12}{3} = 4 \: ore[/tex]
10 robinete .......12 ore
30 robinete........x ore
=> X=(10*12)/30 =120:30 =4 ore