document.write( "Question 638389: On a 1287 mile long road trip in windy conditions, a family calculates their fuel economy to be 18 miles per gallon over the 2 days it takes to reach their destination. On their 2-day return trip, with a similar wind at their backs, their calculations show a fuel economy of 26 miles per gallon. Calculate the expected fuel economy of their vehicle in ideal (non-windy) conditions (f) as well as the influence of the wind (w) in miles per gallon. \n" ); document.write( "

Algebra.Com's Answer #402187 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+f+-+w+=+18+\"$
\n" ); document.write( " $\"+f+%2B+w+=+26+\"$
\n" ); document.write( "Add the equations
\n" ); document.write( " $\"+2f+=+44+\"$
\n" ); document.write( " $\"+f+=+22+\"$ mi/gal
\n" ); document.write( "and
\n" ); document.write( " $\"+f+-+w+=+18+\"$
\n" ); document.write( " $\"+22+-+w+=+18+\"$
\n" ); document.write( " $\"+w+=+22+-+18+\"$
\n" ); document.write( " $\"+w+=+4+\"$ mi/gal
\n" ); document.write( "I think the 1287 mi information is not
\n" ); document.write( "needed for the problem
\n" ); document.write( " \n" ); document.write( "

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