document.write( "Question 416217: a tank has a capacity of10 gal. when it is fill it contains 15% alcohol. how many gallons must be replaced by on 80% alcohol solution to give 10 gallons of 70% solution? \n" ); document.write( "
Algebra.Com's Answer #291635 by mananth(16946)\"\" \"About 
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percent ----------------quantity gallons
\n" ); document.write( "80 ----------------x
\n" ); document.write( "15 ----------------10-x
\n" ); document.write( "70.00% ----------------10 \r
\n" ); document.write( "\n" ); document.write( ">>>
\n" ); document.write( "80x+15(10-x)=70 *10
\n" ); document.write( "80x+150-15x= 700
\n" ); document.write( "80x-15x =700 - 150
\n" ); document.write( "65x=550
\n" ); document.write( "/65
\n" ); document.write( "x=8.46 gallons of 80%
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