document.write( "Question 228905: If you have 90 ounces of water to make a 10% salt solution, what is the decrease in ounces of water to make a 15% salt solution. \n" ); document.write( "

Algebra.Com's Answer #169822 by josmiceli(19441) $\"\"$ $\"About$

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In words:
\n" ); document.write( "(ounces of salt in final solution)/(water + salt in final solution) = 15%
\n" ); document.write( "Let $\"a\"$ = ounces of salt in 10% solution
\n" ); document.write( "given:
\n" ); document.write( " $\"a%2F%2890+%2B+a%29+=+.1\"$
\n" ); document.write( " $\"a+=+.1%2A%2890+%2B+a%29\"$
\n" ); document.write( " $\"a+=+9+%2B+.1a\"$
\n" ); document.write( " $\".9a+=+9\"$
\n" ); document.write( " $\"a+=+10\"$
\n" ); document.write( "Let $\"b\"$ = ounces of water in a 15% solution
\n" ); document.write( " $\"10%2F%2810+%2B+b%29+=+.15\"$
\n" ); document.write( " $\"+10+=+.15%2A%2810+%2B+b%29\"$
\n" ); document.write( " $\"10+=+1.5+%2B+.15b\"$
\n" ); document.write( " $\".15b+=+8.5\"$
\n" ); document.write( " $\"b+=+56.667\"$
\n" ); document.write( "I started with $\"90\"$ ounces of water, so the decrease must be
\n" ); document.write( " $\"90+-+56.667+=+33.333\"$ ounces\r
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