document.write( "Question 345769: How many gallons of a 2% salt solution must be mixed with 20 gallons of a 7% solution to obtain a 4% solution? \n" ); document.write( "

Algebra.Com's Answer #247456 by Fombitz(32388) $\"\"$ $\"About$

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Let $\"A\"$ be the amount of 2% salt solution.
\n" ); document.write( " $\"2A%2B7%2820%29=4%28A%2B20%29\"$
\n" ); document.write( " $\"2A%2B140=4A%2B80\"$
\n" ); document.write( " $\"-2A=-60\"$
\n" ); document.write( " $\"A=30\"$ gallons\r
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