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OpenStudy (anonymous):
A disc jockey must play 12 commercial spots during 1 hour of a radio show. Each commercial is either 30 sec or 60 sec long. If the total commercial time during 1 hour is 8 min, how many 30-sec commercials were played for that hour? How many 60- sec commercials?
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OpenStudy (anonymous):
x + y =12 .5x + y = 8 .5x = 4 x = 8 & y =4
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