document.write( "Question 965084: Sal added3 gallons of gas to a tank,which made the tank half full. A full tank containef f gallons. How many gallons were in the tank originally \n" ); document.write( "
Algebra.Com's Answer #589848 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
Half full is f/2.\r
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\n" ); document.write( "\n" ); document.write( "Let u be the unknown number of gallons in tank at the beginning.
\n" ); document.write( "\"u%2B3=f%2F2\"\r
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\n" ); document.write( "\n" ); document.write( "Solve for u.
\n" ); document.write( "\"highlight%28u=f%2F2-3%29\"
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