document.write( "Question 1189766: How many pounds of a chicken feed that is 45% corn must be mixed with 480 lb of a feed that is 80% corn to make a chicken feed that is 75% corn? \n" ); document.write( "

Algebra.Com's Answer #821210 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "How many pounds of a chicken feed that is 45% corn must be mixed
\n" ); document.write( "with 480 lb of a feed that is 80% corn to make a chicken feed that is 75% corn?
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document.write( "Let x be the unknown value under the problem's question.\r\n" );
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document.write( "Then you have this balance equation for the corn content\r\n" );
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document.write( "    0.45x + 0.80*480 = 0.75*(480+x).\r\n" );
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document.write( "From the equation\r\n" );
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document.write( "    x =  = 80.\r\n" );
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document.write( "ANSWER.  80 pounds should be added.\r\n" );
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document.write( "CHECK.   80*0.45 + 480*0.8 = 420 pounds of corn, the same as (80+480)*0.75, which proves the correctness.\r\n" );
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