document.write( "Question 698523: Please help me solve this word problem: How many liters of water must be added to 20 L of an 85% solution of ammonia that is 70% ammonia? \n" ); document.write( "
Algebra.Com's Answer #430791 by josmiceli(19441)\"\" \"About 
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Let \"+x+\" = liters of water to be added
\n" ); document.write( "\"+.85%2A20+=+17+\" liters of ammonia in 85% solution
\n" ); document.write( "The key is that you have the same liters of ammonia
\n" ); document.write( "at the end as you started with.
\n" ); document.write( "\"+17+%2F+%28+20+%2B+x+%29+=+.7+\"
\n" ); document.write( "\"+17+=+.7%2A%28+20+%2B+x+%29+\"
\n" ); document.write( "\"+17+=+14+%2B+.7x+\"
\n" ); document.write( "\"+.7x+=+3+\"
\n" ); document.write( "\"+x+=+4.286+\"
\n" ); document.write( "4.286 liters of water need to be added
\n" ); document.write( "check:
\n" ); document.write( "\"+17+%2F+%28+20+%2B+4.286+%29+=+.7+\"
\n" ); document.write( "\"+17+%2F+24.286+=+.7+\"
\n" ); document.write( "\"+17+=+.7%2A24.286+\"
\n" ); document.write( "\"+17+=+17+\"
\n" ); document.write( "OK
\n" ); document.write( "
\n" );