document.write( "Question 1122997: How much 10​% solution and how much 65​% solution should be mixed together to make 100 gal of 35​% ​solution?\r
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Algebra.Com's Answer #739190 by Boreal(15235)\"\" \"About 
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x gal of 10% solution
\n" ); document.write( "100-x (everything else) of 65% solution
\n" ); document.write( ".10x+0.65(100-x)=100*0.35=35
\n" ); document.write( ".10x+65-0.65x=35
\n" ); document.write( "-.55x=-30
\n" ); document.write( "x=54.5 gal of 10% solution
\n" ); document.write( "100-x=45.5 gal of 65% solution\r
\n" ); document.write( "\n" ); document.write( "Check--their average is 37.5%, a little high, so this should be fairly even between both, skewed towards the 10% solution, which it is.
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