document.write( "Question 305287: Anas teacher has asked her too add acid to 8 gallons of a 32% acid in water solution to get a solution which is 69 and 7/9 ( sixty nine and seventh ninths percent) acid. How much pure acid should she add \n" ); document.write( "

Algebra.Com's Answer #218638 by Fombitz(32388) $\"\"$ $\"About$

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Let A be the number of gallons of 100% acid that gets added.
\n" ); document.write( " $\"69%2B7%2F9=628%2F9\"$
\n" ); document.write( "Write the concentration equation for the mixture,
\n" ); document.write( " $\"100%2AA%2B32%2A8=%28628%2F9%29%28A%2B8%29\"$
\n" ); document.write( "Multiply both side by 9.
\n" ); document.write( " $\"900A%2B2304=628A%2B5024\"$
\n" ); document.write( " $\"272A=2720\"$
\n" ); document.write( " $\"A=10\"$
\n" ); document.write( "Add 10 gallons of 100% acid.
\n" ); document.write( " \n" ); document.write( "

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