document.write( "Question 378029: Jay's father is twice as old as Jay. In 20 years Jay will be 2/3 as old as his father. How old is Jay and his father now? \n" ); document.write( "

Algebra.Com's Answer #268633 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"f\"$ = Father's age now
\n" ); document.write( "Let $\"j\"$ = Jay's age now
\n" ); document.write( "given:
\n" ); document.write( " $\"f+=+2j\"$
\n" ); document.write( " $\"j+%2B+20+=+%282%2F3%29%2A%28f+%2B+20%29\"$
\n" ); document.write( "--------------------
\n" ); document.write( "By substitution:
\n" ); document.write( " $\"j+%2B+20+=+%282%2F3%29%2A%282j+%2B+20%29\"$
\n" ); document.write( " $\"j+%2B+20+=+%284%2F3%29%2Aj+%2B+40%2F3\"$
\n" ); document.write( "Multiply both sides by $\"3\"$
\n" ); document.write( " $\"3j+%2B+60+=+4j+%2B+40\"$
\n" ); document.write( " $\"j+=+20\"$
\n" ); document.write( "and
\n" ); document.write( " $\"f+=+2j\"$
\n" ); document.write( " $\"f+=+40\"$
\n" ); document.write( "Jay is 20 and his Father is 40
\n" ); document.write( " \n" ); document.write( "

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