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Thirty-two identical loudspeakers at a concert are arranged in a circle, at the center of which...

Thirty-two identical loudspeakers at a concert are arranged in a circle, at the center of which is an observer. If she measures a sound level of 86 dB, how many loudspeakers would have to be shut off in order that the sound level drop to 80 dB?

28

30

16

24

None of these

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