document.write( "Question 640393: suppose a chemist has 10% and 15% acid solutions in stock. how much of each should the chemist mix if 100ml of a 12% solution is desired? \n" ); document.write( "
Algebra.Com's Answer #403163 by sachi(548)\"\" \"About 
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let x ml of 10% & 100-x ml of 15% acid soln were mixed to get 100 ml of 12% soln
\n" ); document.write( "so 10x/100+15[100-x]/100=12
\n" ); document.write( "or 10x+15[100-x]=1200
\n" ); document.write( "or -5x=1200-1500=-300
\n" ); document.write( "or x=60 ml of 10% & 40 ml of 15% soln were mixed
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