document.write( "Question 365004: pure acid is to be added to a 10% acid solution to obtain 90l of 75% solution? what amounts should each be used? \n" ); document.write( "

Algebra.Com's Answer #260233 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"A\"$ be the amount of 100% acid, $\"B\"$ the amount of 10% acid.
\n" ); document.write( "1. $\"A%2BB=90\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"100A%2B10B=75%2890%29\"$
\n" ); document.write( "2. $\"10A%2BB=675\"$
\n" ); document.write( "Subtract eq. 1 from eq. 2,
\n" ); document.write( " $\"10A%2BB-A-B=675-90\"$
\n" ); document.write( " $\"9A=585\"$
\n" ); document.write( " $\"highlight%28A=65%29\"$ liters
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( " $\"65%2BB=90\"$
\n" ); document.write( " $\"highlight%28B=25%29\"$ liters \n" ); document.write( "

\n" );