document.write( "Question 862691: A pharmacist wishes to mix a solution that is 8% minoxidil. She has 70 ml of 5% solution and wishes to add some 10% solution to obtain the desired 8% solution. How much 10% should she add? \n" ); document.write( "

Algebra.Com's Answer #519879 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = ml of 10% solution to be added
\n" ); document.write( " $\"+.1x+\"$ = ml of minoxidil in 10% solution
\n" ); document.write( " $\"+.05%2A70+=+3.5+\"$ ml of minoxidil in 5% solution
\n" ); document.write( "------------------------
\n" ); document.write( " $\"+%28+.1x+%2B+3.5+%29+%2F+%28+x+%2B+70+%29+=+.08+\"$
\n" ); document.write( " $\"+.1x+%2B+3.5+=+.08%2A%28+x+%2B+70+%29+\"$
\n" ); document.write( " $\"+.1x+%2B+3.5+=+.08x+%2B+5.6+\"$
\n" ); document.write( " $\"+.02x+=+2.1+\"$
\n" ); document.write( " $\"+x+=+105+\"$
\n" ); document.write( "105 ml of 10% solution should be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+.1x+%2B+3.5+%29+%2F+%28+x+%2B+70+%29+=+.08+\"$
\n" ); document.write( " $\"+%28+.1%2A105+%2B+3.5+%29+%2F+%28+105+%2B+70+%29+=+.08+\"$
\n" ); document.write( " $\"+%28+10.5+%2B+3.5+%29+%2F+175+=+.08+\"$
\n" ); document.write( " $\"+14+=+.08%2A175+\"$
\n" ); document.write( " $\"+14+=+14+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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