document.write( "Question 1136343: A pharmacist wishes to mix a solution that is 7% Minoxidil. She has on hand 70 ml of a 2% solution and wishes to add some 9% solution to obtain the desired 7% solution. How much 9% solution should she add? \n" ); document.write( "

Algebra.Com's Answer #754100 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = ml of 9% solution to be added
\n" ); document.write( " $\"+%28+.02%2A70+%2B+.09%2Ax+%29+%2F+%28+70+%2B+x+%29+=+.07+\"$
\n" ); document.write( " $\"+1.4+%2B+.09x+=+.07%2A%28+70+%2B+x+%29+\"$
\n" ); document.write( " $\"+1.4+%2B+.09x+=+4.9+%2B+.07x+\"$
\n" ); document.write( " $\"+.02x+=+3.5+\"$
\n" ); document.write( " $\"+x+=+175+\"$
\n" ); document.write( "175 ml of 9% solution should be added
\n" ); document.write( "--------------------
\n" ); document.write( "check:
\n" ); document.write( " $\"+.02%2A70+=+1.4+\"$
\n" ); document.write( " $\"+.09%2A175+=+15.75+\"$
\n" ); document.write( " $\"+%28+1.4+%2B+15.75+%29%2F%28+70+%2B+175+%29+=+17.15+%2F+245+\"$
\n" ); document.write( " $\"+17.15+%2F+245+=+.07+\"$ ( 7% )
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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