document.write( "Question 327380: How much pure acid should be mixed with 2 gallons of a 30% acid solution in order to get 90% acid solution? round to two decimal places. \n" ); document.write( "

Algebra.Com's Answer #234507 by Fombitz(32388) $\"\"$ $\"About$

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Let X be the amount of 100% acid.
\n" ); document.write( " $\"100X%2B30%282%29=90%28X%2B2%29\"$
\n" ); document.write( " $\"100X%2B60=90X%2B180\"$
\n" ); document.write( " $\"10X=120\"$
\n" ); document.write( " $\"highlight%28X=12%29\"$
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\n" ); document.write( "Add 12 gallons of pure acid. \n" ); document.write( "

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