document.write( "Question 121718: A girl is now one-fourth as old as her father, and in seven years she will be one-half as old as her father was twelve years ago. Find their present ages. \n" ); document.write( "

Algebra.Com's Answer #89371 by josmiceli(19441) $\"\"$ $\"About$

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$\"g\"$ = girl's age now
\n" ); document.write( " $\"f\"$ = father's age now
\n" ); document.write( " $\"f+=+4g\"$
\n" ); document.write( " $\"g+%2B+7+=+%281%2F2%29%2A%28f+-+12%29\"$
\n" ); document.write( " $\"g+%2B+7+=+%281%2F2%29%2A%284g+-+12%29\"$
\n" ); document.write( " $\"g+%2B+7+=+2g+-+6\"$
\n" ); document.write( " $\"g+=+13\"$ answer
\n" ); document.write( " $\"f+=+4g\"$
\n" ); document.write( " $\"f+=+52\"$ answer
\n" ); document.write( "check:
\n" ); document.write( " $\"g+%2B+7+=+%281%2F2%29%2A%28f+-+12%29\"$
\n" ); document.write( " $\"13+%2B+7+=+%281%2F2%29%2A%2852+-+12%29\"$
\n" ); document.write( " $\"20+=+20\"$
\n" ); document.write( "OK \n" ); document.write( "

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