The ratio of the loudness of Lala's earphones to the loudness of Polina's earphones to the loudness of Goffy's earphones is 6:5:3, respectively. If Polina's earphones have a loudness of 420 decibels, find the total loudness of all three earphones.
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Home » Mathematics » The ratio of the loudness of Lala's earphones to the loudness of Polina's earphones to the loudness of Goffy's earphones is 6:5:3, respectively. If Polina's earphones have a loudness of 420 decibels, find the total loudness of all three earphones.