document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1105989>Question 1105989</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Tickets to a dance are $7 for students and $8 for guests. How many students are present if  $1350 were collected and only 180 people showed up <BR>\n" );
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document.write( "The average cost per ticket is $1350/180 = $7.50.<br><BR>\n" );
document.write( "Since the average is halfway between the two prices, there must be equal numbers of students and guests, so the number of students was 180/2 = 90.<br><BR>\n" );
document.write( "If you need an algebraic solution for finding the number of students....<br><BR>\n" );
document.write( "let x = number of students<BR>\n" );
document.write( "then 180-x = number of guests<br><BR>\n" );
document.write( "The total cost of the tickets, at $7 per student and $8 per guest, was $1350:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%28x%29%2B8%28180-x%29+=+1350 ALIGN=MIDDLE  ALT=\"7%28x%29%2B8%28180-x%29+=+1350\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7x%2B1440-8x+=+1350 ALIGN=MIDDLE  ALT=\"7x%2B1440-8x+=+1350\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-x+=+-90 ALIGN=MIDDLE  ALT=\"-x+=+-90\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+90 ALIGN=MIDDLE  ALT=\"x+=+90\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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