document.write( "Question 771356: Grace has 3 liters of a mixture containing 49% of boric acid. How much water must be added to make the mixture 42% boric acid? \n" ); document.write( "

Algebra.Com's Answer #470171 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+w+\"$ = liters of water to be added
\n" ); document.write( " $\"+.49%2A3+=+1.47+\"$ liters of boric acid in 49% mixture
\n" ); document.write( "-------------
\n" ); document.write( " $\"+1.47+%2F+%28+w+%2B+3+%29+=+.42+\"$
\n" ); document.write( " $\"+1.47+=+.42%2A%28+w+%2B+3+%29+\"$
\n" ); document.write( " $\"+1.47+=+.42w+%2B+1.26+\"$
\n" ); document.write( " $\"+.42w+=+.21+\"$
\n" ); document.write( " $\"+w+=+.5+\"$
\n" ); document.write( ".5 liters of water must be added
\n" ); document.write( "-------------
\n" ); document.write( "Check:
\n" ); document.write( " $\"+1.47+%2F+%28+.5+%2B+3+%29+=+.42+\"$
\n" ); document.write( " $\"+1.47+=+.42%2A3.5+\"$
\n" ); document.write( " $\"+1.47+=+1.47+\"$
\n" ); document.write( "OK \n" ); document.write( "

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