document.write( "Question 325356: Word problems drive me crazy, can you show me how to solve this one?
\n" ); document.write( "Soybean meal is 16% protein; cornmeal is 8% protein. How many pounds of each should be used to get a 320 pound mixture that is 12% protein?
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Algebra.Com's Answer #232994 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
12% is the average, halfway between 8% and 16%, so it's 160 lb of each.
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\n" ); document.write( "To do it the hard way:
\n" ); document.write( "S + C = 320 (total pounds)
\n" ); document.write( "0.16S + 0.08C = 0.12*320 (total protein)
\n" ); document.write( "16S + 8C = 12*320
\n" ); document.write( "2S + C = 480 no fractions and reduced
\n" ); document.write( "1S + C = 320
\n" ); document.write( "------------- Subtract
\n" ); document.write( "S = 160
\n" ); document.write( "c = 160
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