document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=403725>Question 403725</A>: <I><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "a container has 2 liters of 21% solution sodium hydroxide.\r<BR>\n" );
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document.write( "what is the amount and concentration you must add to this in order to\r<BR>\n" );
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document.write( "end up with 7 liters of 51% solution? </SPAN>\n" );
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document.write( "a container has 2 liters of 21% solution sodium hydroxide.\r<BR>\n" );
document.write( "\n" );
document.write( "what is the amount and concentration you must add to this in order to\r<BR>\n" );
document.write( "\n" );
document.write( "end up with 7 liters of 51% solution?<BR>\n" );
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document.write( "Well, you know you must add 5 liters so the only question is the concentration.<BR>\n" );
document.write( "Let x = concentration<BR>\n" );
document.write( "then<BR>\n" );
document.write( ".21(2) + 5x = .51(7)<BR>\n" );
document.write( ".42 + 5x = 3.57<BR>\n" );
document.write( "5x = 3.15<BR>\n" );
document.write( "x = 0.63<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Solution: 5 liters of 63% solution sodium hydoxide\r<BR>\n" );
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document.write( " </SPAN>\n" );
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