the music for Alyssa's dance routine last exactly 4 min. when she dances her routine, she starts with her music and finishes 12 seconds before the music ends. what percent of the time the music is playing is Alyssa dancing.

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07-11-2017
Mathematics

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the music for Alyssa's dance routine last exactly 4 min. when she dances her routine, she starts with her music and finishes 12 seconds before the music ends. what percent of the time the music is playing is Alyssa dancing.

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coolstick coolstick · Answer 1 · 2017-11-07T04:42:31+01:00

If her music lasts 4 minutes, her music is 60*4=240 seconds since there are 60 seconds in a minute. Next, since her dance is 12 seconds less than the music, her dance is 240-12=228 seconds long. To finish this up, we have 228/240. I challenge you to figure out the percentage on your own!

As an example, we have 123/463, which is around 0.266. Multiplying that by 100, we end up with around 26.6 percent as the percent 123 is of 463