document.write( "Question 522537: Please help me with this question...(How much pure acid shoud be mixed with 2 gallons of an 80% acid solution in order to get a 90% acid solution?) \n" ); document.write( "

Algebra.Com's Answer #346904 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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(How much pure acid should be mixed with 2 gallons of an 80% acid solution in order to get a 90% acid solution?)
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\n" ); document.write( "Let a = amt of 100% acid required
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\n" ); document.write( ".80(2) + a = .90(a+2)
\n" ); document.write( "1.6 + a = .9a + 1.8
\n" ); document.write( "a - .9a = 1.8 - 1.6
\n" ); document.write( ".1a = .2
\n" ); document.write( "a = .2/.1
\n" ); document.write( "a = 2 gal of acid required \n" ); document.write( "

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