document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=334786>Question 334786</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, and good part of day! Please help me!\r<BR>\n" );
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document.write( "A pollution control device on a car reduces the amount of an air pollutant by 55 ppm.  When the drived is installed, it will take a car 7 hours to emit the same amount of the pollutant that it formerly did in 2h.  What was the original concentration of the pollutant in the car's exhaust?\r<BR>\n" );
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document.write( "Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #239876 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</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=239876\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let the original pollutant be x ppm / hour<BR>\n" );
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document.write( "the device reduces by 55 ppm<BR>\n" );
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document.write( "so the pollutant released will be x-55./ hour<BR>\n" );
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document.write( "2x= 7(x-55)<BR>\n" );
document.write( "2x=7x-385<BR>\n" );
document.write( "add -7x to both sides<BR>\n" );
document.write( "2x-7x=7x-7x-385<BR>\n" );
document.write( "-5x=-385<BR>\n" );
document.write( "divide by -5<BR>\n" );
document.write( "x= -385/-5<BR>\n" );
document.write( "x=77 ppm - original  </SPAN>\n" );
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