document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=327007>Question 327007</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Trying to figure out this story problem and I am having some difficulty.<BR>\n" );
document.write( "A disc jockey must play 16 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 13 mins. How many 30-second commercials were played that hour? And how many 60-second commercials?\r<BR>\n" );
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document.write( "Thanks :o) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #234166 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16949)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=234166\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let 30 second commercial be x<BR>\n" );
document.write( "60 second commercial will be 16-x<BR>\n" );
document.write( "13 minutes = 13*60 seconds = 780 <BR>\n" );
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document.write( "30x+60(16-x)= 780<BR>\n" );
document.write( "30x+960-60x=780<BR>\n" );
document.write( "-30x+960=780<BR>\n" );
document.write( "add -960 to both sides<BR>\n" );
document.write( "-30x+960-960=780-960<BR>\n" );
document.write( "-30x=-180<BR>\n" );
document.write( "divide by  -30<BR>\n" );
document.write( "x=-180/-30<BR>\n" );
document.write( "x= 6 which is 30 second commercial<BR>\n" );
document.write( "16-x = 16-6= 10 60 second commercials<BR>\n" );
document.write( "..<BR>\n" );
document.write( "CHECK<BR>\n" );
document.write( "6*30+10*60=780 seconds= 13 minutes </SPAN>\n" );
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