document.write( "Question 928606: A pharmacist wishes to mix a solution that is 8% minoxidil. She has 70 ml of 4% 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 #563716 by TimothyLamb(4379) $\"\"$ $\"About$

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x = ml of 4% = 70
\n" ); document.write( "y = ml of 10%
\n" ); document.write( "---
\n" ); document.write( "4x + 10y = 8(x + y)
\n" ); document.write( "4x + 10y = 8x + 8y
\n" ); document.write( "2y = 4x
\n" ); document.write( "y = 2x
\n" ); document.write( "y = 2*70
\n" ); document.write( "y = 140
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "add 140 ml of 10%
\n" ); document.write( "---
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