ol li1 Les bombetes de llumli li2 ul liBombetes 100W= x+4li li3 Bombetes 60W= xli ul li li4 ul li60x+100x+4=2640li li5 60x+100x+400=2640li li6 60x+100x=2640-400li li7 160x=2240li li8 X=2240160=14li ul li li9 ul liBombetes 60W=14li li10 Bombetes100W=18li ul li ol