document.write( "Question 939224: a pharmacist has 700ml of a solution that is 70% active ingredient. how much pure water should she add to the solution to get a solution that is 10% active ingredient? \n" ); document.write( "
Algebra.Com's Answer #572297 by TimothyLamb(4379)\"\" \"About 
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x = ml of pure water
\n" ); document.write( "y = ml of 70% ingredient/water = ml of 30% water/ingredient
\n" ); document.write( "z = ml of 10% ingredient/water = ml of 90% water/ingredient
\n" ); document.write( "---
\n" ); document.write( "y = 700
\n" ); document.write( "1x + 0.30y = 0.90z
\n" ); document.write( "z = x + y
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form
\n" ); document.write( "---
\n" ); document.write( "y = 700
\n" ); document.write( "1x + 0.30y - 0.90z = 0
\n" ); document.write( "x + y - z = 0
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
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\n" ); document.write( "answer:
\n" ); document.write( "x = ml of pure water = 4200
\n" ); document.write( "y = 700
\n" ); document.write( "z = 4900
\n" ); document.write( "---
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