document.write( "Question 947477: How much pure alcohol must a nurse add to 10 cm^3 of a 60% alcohol solution to strengthen it to a 90% solution? \n" ); document.write( "

Algebra.Com's Answer #578133 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+x+\"$ = cm3 of pure alcohol to be added
\n" ); document.write( " $\"+.6%2A10+=+6+\"$ cm3 of pure alcohol in 60% solution
\n" ); document.write( "--------------------
\n" ); document.write( " $\"+%28+x+%2B+6+%29+%2F+%28+x+%2B+10+%29+=+.9+\"$
\n" ); document.write( " $\"+x+%2B+6+=+.9%2A%28+x+%2B+10+%29+\"$
\n" ); document.write( " $\"+x+%2B+6+=+.9x+%2B+9+\"$
\n" ); document.write( " $\"+.1x+=+3+\"$
\n" ); document.write( " $\"+x+=+30+\"$
\n" ); document.write( "30 cm3 of pure alcohol should be added
\n" ); document.write( "-------------------
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+x+%2B+6+%29+%2F+%28+x+%2B+10+%29+=+.9+\"$
\n" ); document.write( " $\"+%28+30+%2B+6+%29+%2F+%28+30+%2B+10+%29+=+.9+\"$
\n" ); document.write( " $\"+36+%2F+40+=+.9+\"$
\n" ); document.write( " $\"+36+=+.9%2A40+\"$
\n" ); document.write( " $\"+36+=+36+\"$
\n" ); document.write( "OK \n" ); document.write( "

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