An energy-saving light bulb wastes 5 j of energy for every 20 j of energy it radiates as light, how much energy is supplied to it every 20 j of energy it radiates as light
An energy-saving light bulb wastes 5 j of energy for every 20 j of energy it radiates as light, how much energy is supplied to it every 20 j of energy it radiates as light
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