While listening to your new favorite band, Morphine, you notice that in one of their songs, the length of each bar decreases by 6 beats minute (bpm) from the previous bar If the song started at 120 bpm (typical for rock and roll) and the song ended at 90 bpm for the last bar,

(a) how many bars were in the song?

(b) what was the mean bpm of the song? 

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