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Distance at which 75W bulb will have the same brightness

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At what distance will a 75 W light bulb have the same apparent brightness as a 100 W bulb viewed from a distance of 24.7 m? (Assume that both bulbs convert electrical power to light with the same efficiency.)

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The distance between 75W bulbs that have the same brightness are determined. A complete, neat and step-by-step solution is provided in the attached file.

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At what distance will a 75 W light bulb have the same apparent brightness as a 100 W bulb viewed from a distance of 24.7 m? ...

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