document.write( "Question 268527: How much pure acid should be mixed with 9 gallons of a 50% acid solution in order to get an 80% acid solution? \n" ); document.write( "

Algebra.Com's Answer #196772 by CharlesG2(834) $\"\"$ $\"About$

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How much pure acid should be mixed with 9 gallons of a 50% acid solution in order to get an 80% acid solution?\r
\n" ); document.write( "\n" ); document.write( "x gallons of 100% + 9 gallons of 50% = 9+x gallons of 80%
\n" ); document.write( "1.00 * x + 0.50 * 9 = 0.8 * (9 + x)
\n" ); document.write( "x + 4.5 = 7.2 + 0.8x
\n" ); document.write( "0.2x = 2.7
\n" ); document.write( "x = 13.5 gallons\r
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