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Two 100-w light bulbs used a total of 400wh of energy. For how many hours did the light bulbs use power?
I'm assuming that you meant to write 'two 100-w per hour light bulbs used a total of 400w. how many hours did the bulbs run'
so each used 100w per hour and there are 2 light bulbs so in 1 hour 200w is used 200wh times x hour=200wx=400w divide both sides by 200w x=2 they ran for 2 hours
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