document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=154720>Question 154720</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0495012661/algebrahomeworkh>college algebra ninth edition</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A nurse has 1 liter of a solution that is 20% alcohol. How much pure alcohol must she add to bring the solution up to a 25% concentration? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #113969 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=113969\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A nurse has 1 liter of a solution that is 20% alcohol. How much pure alcohol must she add to bring the solution up to a 25% concentration?<BR>\n" );
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document.write( "The 1000 cc of solution is 20% alcohol and 80% water, or 200 cc alcohol and 800 cc water.<BR>\n" );
document.write( "She wants it to be 1 part in 4 of alcohol and 3 parts of 4 of water, so it will be 3 times as much water as alcohol. 1/3 of 800 is 266.67, so she must add 66.67 cc of alcohol.<BR>\n" );
document.write( "To check:<BR>\n" );
document.write( "266.67/1066.67 = 1/4 = 25%<BR>\n" );
document.write( "(If she has to work this out, she might drink most of it.) </SPAN>\n" );
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