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A worker stands on a factory floor and a sound-level meter shows a reading of 55 dB at that point. A machine 3 feet away

A worker stands on a factory floor and a sound-level meter shows a reading of 55 dB at that point. A machine 3 feet away is turned on, and the meter jumps to 90 dB. What will the SLM read if the machine is moved to a point 12 feet away

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