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5 robinete umpla un bazin in 3 ore
12 robinete in cate ore va umple bazinul?
DAU COROANA!


Răspuns :

5 robinete--------3 ore
12 robinete..........x ore

x=(5*3)/12=15/12 ore[tex] \frac{12*3}{5} = \frac{36}{5} [/tex]
5 robinete=3ore=180 min
180x5=900 minute

900:12=75 minute



in 75 minute vor umple bazinul
75 min=1 ora si 15 min