document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=619794>Question 619794</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 5.<BR>\n" );
document.write( "How many pounds of an $83 per pound substance must be mixed with an $11 per pound substance to get 240 lbs of an alloy which will cost $28 per pound? Round to the nearest pound. </SPAN>\n" );
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document.write( "How many pounds of an $83 per pound substance must be mixed with an $11 per pound substance to get 240 lbs of an alloy which will cost $28 per pound? Round to the nearest pound.<BR>\n" );
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document.write( "Do it like this one:<BR>\n" );
document.write( "if a 14% acid solution is mixed with a 19% acid solution to produce 45 gallons of a 15% acid solution how much (in gallons) of each solution should be used?<BR>\n" );
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document.write( "f = 14%<BR>\n" );
document.write( "n = 19%<BR>\n" );
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document.write( "f + n = 45 (total gallons)<BR>\n" );
document.write( "14f + 19n = 15*45 (total acid)<BR>\n" );
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document.write( "n = 45 - f<BR>\n" );
document.write( "Sub for n<BR>\n" );
document.write( "14f + 19*(45-f) = 675<BR>\n" );
document.write( "14f + 855 - 19f = 675<BR>\n" );
document.write( "-5f = -180<BR>\n" );
document.write( "f = 36 gallons of 14%<BR>\n" );
document.write( "n = 9 gallons of 19% </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );