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Music is been played in two opposite gal...

Music is been played in two opposite galleries with certain group of people. In the first gallery a group of 4 singers were singing and in the second gallery 9 singers were singing. The two galleries are separate by the distance of 70m. Where should a person stand for hearing the same intensity of the singers voice? (Hit: The ratio of the sound intensity is equal to square of the ratio of their corresponding distances).

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