by what percent os a 100- watt light bulb brighter than a 60 watt light bulb

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1. By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? Round to the nearest tenth.40/60 = 2/3 = 2 ÷ 3 =
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2. By what percent is a 100-watt light bulb brighter than a 60-watt light bulb?I'm not sure the equation to use to solve this one.
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3. By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? (Round percent to the nearest tenth.)
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4. By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? (Round percent to the nearest tenth.
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