document.write( "Question 617154: Soybean meal is 12% protein; cornmeal is 6% protein.?
\n" ); document.write( "How many pounds of each should be mixed together in order to get a 240-lb mixture that is 80% protein?
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Algebra.Com's Answer #388166 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
*** note: there is no way you can get 80% protein from
\n" ); document.write( "the mixture. I changed it to 8%, which I think is
\n" ); document.write( "what you meant ***
\n" ); document.write( "Let \"+a+\" = pounds of soybean meal needed
\n" ); document.write( "Let \"+b+\" = pounds of cornmeal needed
\n" ); document.write( "\"+.12a+\" = pounds of protein in soybean meal
\n" ); document.write( "\"+.06b+\" = pounds of protein in cornmeal
\n" ); document.write( "----------------
\n" ); document.write( "(1) \"+a+%2B+b+=+240+\"
\n" ); document.write( "(2) \"+%28+.12a+%2B+.06b+%29+%2F+240+=+.08+\"
\n" ); document.write( "--------------------------
\n" ); document.write( "(2) \"+.12a+%2B+.06b+=+19.2+\"
\n" ); document.write( "(2) \"+12a+%2B+6b+=+1920+\"
\n" ); document.write( "(2) \"+2a+%2B+b+=+320+\"
\n" ); document.write( "Subtract (1) from (2)
\n" ); document.write( "(2) \"+2a+%2B+b+=+320+\"
\n" ); document.write( "(1) \"+-a+-+b+=+-240+\"
\n" ); document.write( "\"+a+=+80+\"
\n" ); document.write( "and, since
\n" ); document.write( "(1) \"+a+%2B+b+=+240+\"
\n" ); document.write( "(1) \"+80+%2B+b+=+240+\"
\n" ); document.write( "(1) \"+b+=+160+\"
\n" ); document.write( "80 pounds of soybean meal is needed
\n" ); document.write( "160 pounds of cornmeal is needed
\n" ); document.write( "check:
\n" ); document.write( "(2) \"+%28+.12%2A80+%2B+.06%2A160+%29+%2F+240+=+.08+\"
\n" ); document.write( "(2) \"+%28+9.6+%2B+9.6+%29+%2F+240+=+.08+\"
\n" ); document.write( "(2) \"+19.2+%2F+240+=+.08+\"
\n" ); document.write( "(2) \"+19.2+=+19.2+\"
\n" ); document.write( "OK
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