document.write( "Question 157946: A pharmacist needs 70 liters of a 50% alcohol solution. She has availible a 30 % solution and an 80% solution. How many liters of each solution should she mix to obtain 70 liters of a 50% alcohol solution ?\r
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\n" ); document.write( "\n" ); document.write( "Also from a take home exam
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Algebra.Com's Answer #116403 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
70*.5=.30X+.80(70-X)
\n" ); document.write( "35=.30X+56-.80X
\n" ); document.write( "35-56=-.50X
\n" ); document.write( "-21-.5X
\n" ); document.write( "X=-21/-.5
\n" ); document.write( "X=42 LITERS OF THE 30% ALCOHOL IS NEEDED.
\n" ); document.write( "70-42=28 LITERS OF THE 50% ALCOHOL IS ALSO NEEDED.
\n" ); document.write( "PROOF:
\n" ); document.write( "70*.5=.30*42+.80*28
\n" ); document.write( "35=12.6+22.4
\n" ); document.write( "35=35
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