document.write( "Question 102385: how much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get a 70% acid solution? \n" ); document.write( "
Algebra.Com's Answer #74527 by stanbon(75887)\"\" \"About 
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how much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get a 70% acid solution?
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\n" ); document.write( "Comment: Follow the acid.
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\n" ); document.write( "40% solution DATA:
\n" ); document.write( "Amt = 7 gallons ; amt of acid = 0.07*7 = 0.49 gallons
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\n" ); document.write( "100% solution DATA;
\n" ); document.write( "Amt = x gallos ; amt of acid = x gallons
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\n" ); document.write( "70% mixture DATA:
\n" ); document.write( "amt = x+7 gallons ; amt of acid = 0.70(x+7)= (0.70x + 4.9) gallons
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\n" ); document.write( "EQUATION:
\n" ); document.write( "acid + acid = acid
\n" ); document.write( "0.49 + x = 0.70x + 4.9
\n" ); document.write( "0.30x = 4.41
\n" ); document.write( "x = 14.7 gallons (amt of 100% solution that must be added)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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