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SiminaaaFerariu
a fost răspuns

Patru becuri consuma in 3 ore 3 KW.Cat consuma 6 becuri in 20 de ore!

Răspuns :

4b in 3 ore=3 kw
4b in 1ora=1 kw
1b in 1 ora=1:4=0.25 kw
6b=0.25x6=1.5/ora
1.5x20=30 kw in 20 ore