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a disc jockey must play 14 commercial spots during 1 hour of a radio show?

Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 11 min, how many 30-second commercials were played that hour? How many 60- second commercials> 30 sec_____ 60sec_______

Public Comments

1. x*0.5+(14-x)*1=11 0.5x+14-x=11 0.5x=3 x=6 So 6 30 second commercials, and 8 60 second commercials.