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Trei robinete pot umple un bazin in 12 ore.In cate ore pot umple acelasi bazin 4 robinete,cu acelasi debut?

Răspuns :

3 robinete ------12 ore
4 robinete ------x ore
x = 3 × 12 : 4
x = 36 : 4
x = 9 ore

3 r ................. 12 h

4 r ....................x h

x = 3·12 : 4 = 36 : 4 = 9 ore