document.write( "Question 751561: Mary is mixing up some punch for her party tomorrow. She messed up at first and ended up with two different punches, one that was too strong and one that was too weak. The first was too weak, 20 liters of an 18% punch mix and the second was too strong, 50 liters of a 30% mix. She wanted all the punch to have 25% punch mix. How can she mix what she has with water to create the proper punch? \n" ); document.write( "

Algebra.Com's Answer #457283 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+.18%2A20+=+3.6+\"$ = liters of punch in 18% punch mix
\n" ); document.write( " $\"+.3%2A50+=+15+\"$ = liters of punch in 30% punch mix
\n" ); document.write( "Let $\"+w+\"$ = liters of water to be added to get 25% punch mix
\n" ); document.write( "-----------------------------------------------------
\n" ); document.write( " $\"+%28+3.6+%2B+15+%29+%2F+%28+20+%2B+50+%2B+w+%29+=+.25+\"$
\n" ); document.write( " $\"+18.6+%2F+%28+70+%2B+w+%29+=+.25+\"$
\n" ); document.write( " $\"+18.6+=+.25%2A%28+70+%2B+w+%29+\"$
\n" ); document.write( " $\"+18.6+=+17.5+%2B+.25w+\"$
\n" ); document.write( " $\"+.25w+=+1.1+\"$
\n" ); document.write( " $\"+w+=+4.4+\"$
\n" ); document.write( "4.4 liters of water should be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+18.6+%2F+%28+70+%2B+w+%29+=+.25+\"$
\n" ); document.write( " $\"+18.6+%2F+%28+70+%2B+4.4+%29+=+.25+\"$
\n" ); document.write( " $\"+18.6+=+.25%2A74.4+\"$
\n" ); document.write( " $\"+18.6+=+18.6+\"$
\n" ); document.write( "OK\r
\n" ); document.write( "
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