document.write( "Question 1038405: a chemist wishes to mix a solution that is 4% acid. She has on hand 8 liters of a 2% acid solution and wishes to add some 8% acid solution to obtain the desired 4% acid solution. How much 8% acid solution should she add \n" ); document.write( "

Algebra.Com's Answer #653119 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = liters of 8% acid to be added
\n" ); document.write( " $\"+.02%2A8+=+.16+\"$ liters of acid in 2% solution
\n" ); document.write( "------------------------------------------
\n" ); document.write( " $\"+%28+.16+%2B+.08x+%29+%2F+%28+8+%2B+x+%29+=+.04+\"$
\n" ); document.write( " $\"+.16+%2B+.08x+=+.04%2A%28+8+%2B+x+%29+\"$
\n" ); document.write( " $\"+.16+%2B+.08x+=+.32+%2B+.04x+\"$
\n" ); document.write( " $\"+.04x+=+.16+\"$
\n" ); document.write( " $\"+x+=+4+\"$
\n" ); document.write( "------------
\n" ); document.write( "She should add 4 liters of 8% acid
\n" ); document.write( "------------------------------
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+.16+%2B+.08x+%29+%2F+%28+8+%2B+x+%29+=+.04+\"$
\n" ); document.write( " $\"+%28+.16+%2B+.08%2A4+%29+%2F+%28+8+%2B+4+%29+=+.04+\"$
\n" ); document.write( " $\"+%28+.16+%2B+.32+%29+%2F+12+=+.04+\"$
\n" ); document.write( " $\"+.48+=+.04%2A12+\"$
\n" ); document.write( " $\"+.48+=+.48+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );