document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1844>Question 1844</A>: <I><SPAN STYLE=\"word-break: break-all;\"> HOW MANY GRAMS OF PURE SALT MUST BE ADDED TO 40 GRAMS OF A 20% SALT SOLUTION TO MAKE A SOLUTION THAT IS 36% SALT? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #705 by </B><A HREF=/tutors/aboutme.mpl?userid=longjonsilver><B>longjonsilver(2297)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=longjonsilver><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=longjonsilver><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=705\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> For a 20% salt solution, one fifth (ie 20%) is salt. As we have 40g of the solution, then 8g (ie a fifth) must be salt.\r<BR>\n" );
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document.write( "we would work out the % by saying (8/40)*100 = 20%\r<BR>\n" );
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document.write( "However, we now will add some more salt. Call this unknown amount, x grams. We therefore increase the amount of salt by 8 and the total amount by 8 too. And the new salinity is 36%. So, we have <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%288%2Bx%29%2F%2840%2Bx%29%29%2A100+=+36 ALIGN=MIDDLE  ALT=\"%28%288%2Bx%29%2F%2840%2Bx%29%29%2A100+=+36\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Re-arranging this gives\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%288%2Bx%29%2F%2840%2Bx%29%29+=+%280.36%29 ALIGN=MIDDLE  ALT=\"%28%288%2Bx%29%2F%2840%2Bx%29%29+=+%280.36%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%288%2Bx%29+=+%280.36%29%2840%2Bx%29 ALIGN=MIDDLE  ALT=\"%288%2Bx%29+=+%280.36%29%2840%2Bx%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%288%2Bx%29+=+%2814.4+%2B+%280.36%29%28x%29%29 ALIGN=MIDDLE  ALT=\"%288%2Bx%29+=+%2814.4+%2B+%280.36%29%28x%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Rearranging this again gives\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%280.64%29%28x%29+=+%286.4%29 ALIGN=MIDDLE  ALT=\"%280.64%29%28x%29+=+%286.4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "hence x=10g of salt required.\r<BR>\n" );
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document.write( "We can see this in the formula...it is now (18/50)*100 which is 36%\r<BR>\n" );
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document.write( "cheers<BR>\n" );
document.write( "Jon. </SPAN>\n" );
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