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Mathematics
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A disc jockey must play 16 commercial spots during 1 hour of radio show. Each commercial is either 30 seconds long or 60 seconds long. If the total commercial time for one hour is 13 minutes. How many 30 second commercials did the disc jokey play, and how many 60 second commercials did they play?
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6 - 30 second 10 - 1 minute
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