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A disc jockey must play 16 commercial sports during 1 hour of a radio show. Each commercial is either 30 secon?

A disc jockey must play 16 commercial sports during 1 hour of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during the 1 hour is 13 min, how many 30 second commercials were played that hour? How many 60 seconds commercials were played.

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1. x + y = 16 .5x + y = 13 .5x = 3 x = 6 .5 minute (30 second) spots y= 10 1 minute spots
2. http://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.201482.html Hope this helps