document.write( "Question 358540: If you have a solution that's 40% alcohol and another that's 70% alcohol how much of the 70% alcohol do you have to add to the 40% to make the 40% raise to 50% alcohol. Start with 100 ml of the 70% solution? \n" ); document.write( "
Algebra.Com's Answer #255946 by checkley77(12844)\"\" \"About 
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.70*100+.40X=.50(100+X)
\n" ); document.write( "70+.40X=50+.50X
\n" ); document.write( ".40X-.50X=50-70
\n" ); document.write( "-.10X=-20
\n" ); document.write( "X=-20/-.10
\n" ); document.write( "X=200 ml. OF THE 40% ALCOHOL IS USED.
\n" ); document.write( "PROOF:
\n" ); document.write( ".70*100+.40*200=.50(100+200)
\n" ); document.write( "70+80=.5*300
\n" ); document.write( "150=150
\n" ); document.write( "
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