document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=876989>Question 876989</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this problem:<BR>\n" );
document.write( "A glass 1 cm thick allows only 80% of the light to filter through. How much light will filter through a glass 2 cm thick? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #529105 by </B><A HREF=/tutors/aboutme.mpl?userid=KMST><B>KMST(5328)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=KMST><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=KMST><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=529105\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The first 1-cm of glass thickness allows <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=80%2F100=8%2F5=0.8 ALIGN=MIDDLE  ALT=\"80%2F100=8%2F5=0.8\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the light to filter through.<BR>\n" );
document.write( "The next 1-cm of glass thickness allows <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=80%2F100=8%2F5=0.8 ALIGN=MIDDLE  ALT=\"80%2F100=8%2F5=0.8\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the remaining light to filter through.<BR>\n" );
document.write( "The fraction that filter through the 2-cm thickness is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%284%2F5%29%284%2F5%29=%284%2F5%29%5E2=16%2F25=64%2F100=0.64 ALIGN=MIDDLE  ALT=\"%284%2F5%29%284%2F5%29=%284%2F5%29%5E2=16%2F25=64%2F100=0.64\"   DISABLED_style= \"max-width:90%; height:auto;\" > .<BR>\n" );
document.write( "So 64% of the light will filter through.<BR>\n" );
document.write( " <BR>\n" );
document.write( "If it is a solution of an unchanging chemical species, the concentration of that substance plays the same role as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Analytical chemists (like me) use that for chemical analysis. </SPAN>\n" );
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