document.write( "Question 675973: Jones has a 90% solution of boric acid in his pharmacy, which he reduces to the required strength by adding distilled water. How much solution and how much water must he use to get 2 quarts of 10% solution? \n" ); document.write( "

Algebra.Com's Answer #420150 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+w+\"$ = quarts of water to be added
\n" ); document.write( "Let $\"+s+\"$ = quarts of 90% boric acid solution to be used
\n" ); document.write( " $\"+.9s+\"$ = quarts of boric acid in 90% solution
\n" ); document.write( "---------------
\n" ); document.write( "(1) $\"+w+%2B+s+=+2+\"$
\n" ); document.write( "(2) $\"+.9s+%2F+2+=+.1+\"$
\n" ); document.write( "-----------------
\n" ); document.write( "(2) $\"+.9s+=+.2+\"$
\n" ); document.write( "(2) $\"+s+=+.2%2F.9+\"$
\n" ); document.write( "(2) $\"+s+=+2%2F9+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+w+%2B+s+=+2+\"$
\n" ); document.write( "(1) $\"+w+%2B+2%2F9+=+2+\"$
\n" ); document.write( "(1) $\"+w+=+18%2F9+-+2%2F9+\"$
\n" ); document.write( "(1) $\"+w+=+16%2F9+\"$
\n" ); document.write( "16/9 of a quart of water is to be added
\n" ); document.write( "2/9 of a quart of 90% boric acid solution is to be used
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+.9s+%2F+2+=+.1+\"$
\n" ); document.write( "(2) $\"+.9%2A%282%2F9%29+%2F+2+=+.1+\"$
\n" ); document.write( "(2) $\"+.2%2F2+=+.1+\"$
\n" ); document.write( "(2) $\"+.1+=+.1+\"$ \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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