document.write( "Question 324965: Soybean meal is 12% protein; cornmeal so 6% protein. How many pounds of each should be mixed together in order to get a 240lb mixture that is 9% protein?
\n" ); document.write( "How many lbs of cornmeal should be in the mixture? ___lbs?
\n" ); document.write( "How many lbs of soybean meal should be in the mixture? ___lbs?
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Algebra.Com's Answer #232739 by Fombitz(32388)\"\" \"About 
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Let S be the amount of soybeans, C the amount of cornmeal.
\n" ); document.write( "1.\"S%2BC=240\"
\n" ); document.write( "2.\"12S%2B6C=9%28240%29=2160\"
\n" ); document.write( "From eq. 1,
\n" ); document.write( "\"S=240-C\"
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( "\"12%28240-C%29%2B6C=2160\"
\n" ); document.write( "\"2880-12C%2B6C=2160\"
\n" ); document.write( "\"-6C=-720\"
\n" ); document.write( "\"C=120\"
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( "\"S%2B120=240\"
\n" ); document.write( "\"S=120\"
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\n" ); document.write( "Use 120 lb of each soybeans and cornmeal.
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