document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=473272>Question 473272</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a 10% acid solution is to be mixed with a 50% solution to get 200 litres of a 20% solution. how many litres of each solution should be used? </SPAN>\n" );
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document.write( "let x = 10%<BR>\n" );
document.write( "let y = 50% <BR>\n" );
document.write( "x + y = 200<BR>\n" );
document.write( "   y= 200 -x<BR>\n" );
document.write( "0.10x+0.50y = 200* 0.20<BR>\n" );
document.write( " substitution : y= 200 -x<BR>\n" );
document.write( "0.10x+0.50(200-x) = 200* 0.20<BR>\n" );
document.write( "0.10x + 100- 0.50x = 40<BR>\n" );
document.write( "             -0.4x = 40 -100<BR>\n" );
document.write( "                 x= -60/-0.4<BR>\n" );
document.write( "                 x=15<BR>\n" );
document.write( "substitution : x = 15 find y<BR>\n" );
document.write( "15 + y = 200<BR>\n" );
document.write( "     y = 200-15<BR>\n" );
document.write( "      y = 185\r<BR>\n" );
document.write( "\n" );
document.write( "10% acid solution is should be used 15 litres<BR>\n" );
document.write( "50% acid solution is should be used 185 litres </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );