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Patru becuri consuma in 3 ore 3 kW.Cat consuma 6 becuri in 20 ore?

Răspuns :

4 becuri....3 kw=>1 bec...0,75 kw
6 becuri in 3 ore consuma 4,5kw
6 becuri in 20 ore consuma x kw
x=20x4,5/3
x=30kw
6 becuri in 3 ore 4.5 kw
in 20 ore 4.5*20/3 30kw