document.write( "Question 126663: A pharmasist needs 500 milliliters of a 20% phenobarbital solution. But has only 5% and 25% phenobarbital solutions available. Find how many milliliters of each he should mix to get the desired solution. \n" ); document.write( "

Algebra.Com's Answer #92797 by josmiceli(19441) $\"\"$ $\"About$

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$\"%28.25x+%2B+.05y%29+%2F+500+=+.2\"$
\n" ); document.write( " $\"x+%2B+y+=+500\"$
\n" ); document.write( " $\"y+=+500+-+x\"$
\n" ); document.write( " $\"%28.25x+%2B+.05%28500+-+x%29%29+%2F+500+=+.2\"$
\n" ); document.write( " $\"%28.25x+%2B+25+-+.05x%29+%2F+500+=+.2\"$
\n" ); document.write( " $\"%28.2x+%2B+25%29+%2F+500+=+.2\"$
\n" ); document.write( " $\".2x+%2B+25+=+100\"$
\n" ); document.write( " $\".2x+=+75\"$
\n" ); document.write( " $\"x+=+375\"$
\n" ); document.write( " $\"y+=+500+-+375\"$
\n" ); document.write( " $\"y+=+125\"$
\n" ); document.write( "He needs 375 ml of the 25% solution and 125 ml of the 5% solution \n" ); document.write( "

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