document.write( "Question 465633: 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 durinf 1 hour is 11 min, how many 30 second commercials were played that hour? \n" ); document.write( "

Algebra.Com's Answer #319069 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "Let x and (14-x) represent the number of 60sec and 30sec commmercials respectively
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document.write( "Question states***
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document.write( " 60x + 30(14-x) = 11*60
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document.write( "Solving for x
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document.write( "      30x = 660 - 420
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document.write( "       30x = 240
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document.write( "         x = 8, the number of 60sec.  Six the number of 30sec\r
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document.write( "CHECKING our Answer***
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document.write( " 8*60 + 6*30 = 480 + 180 = 660sec or 11 min \n" );
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