document.write( "Question 722703: \r
\n" ); document.write( "\n" ); document.write( "A druggist needs 20 oz of a 20% Phenobarital solution, but he only has a 5% solution and a 25% solution in stock. How many ounces of each available solution would he need to make the 20% solution he needs?
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Algebra.Com's Answer #442851 by checkley79(3341)\"\" \"About 
You can put this solution on YOUR website!
.25X+.05(20-X)=.20*20
\n" ); document.write( ".25X+1-.05X=4
\n" ); document.write( ".20X=4-1
\n" ); document.write( ".20X=3
\n" ); document.write( "X=3/.20
\n" ); document.write( "X=15 OZ. OF THE 25% SOLUTION IS USED.
\n" ); document.write( "20-15=5 OZ. OF THE 5% SOLUTION IS USED.
\n" ); document.write( "PROOF:
\n" ); document.write( ".25*15+.05*5=.20*20
\n" ); document.write( "3.75+.25=4
\n" ); document.write( "4=4
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