document.write( "Question 649341: Jenifer is 20 years old and her sister is 4 years old. In how many years will Jenifer be four times as old as her sister? \n" ); document.write( "

Algebra.Com's Answer #406929 by josmiceli(19441) $\"\"$ $\"About$

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Add $\"+x+\"$ years to both their ages
\n" ); document.write( "given:
\n" ); document.write( " $\"+20+%2B+x+=+4%2A%28+4+%2B+x+%29+\"$
\n" ); document.write( " $\"+20+%2B+x+=+16+%2B+4x+\"$
\n" ); document.write( " $\"+3x+=+4+\"$
\n" ); document.write( " $\"+x+=+4%2F3+\"$
\n" ); document.write( " $\"+x+=+1+%2B+1%2F3+\"$
\n" ); document.write( "( note that 1/3 year = 4 months )
\n" ); document.write( "In 1 year and 4 months Jennifer will
\n" ); document.write( "be 2x as old as her sister
\n" ); document.write( "check:
\n" ); document.write( "J will be $\"+20+%2B+4%2F3+=+21+%2B+1%2F3+\"$
\n" ); document.write( "Sis will be $\"+4+%2B+4%2F3+=+5+%2B+1%2F3+\"$
\n" ); document.write( " $\"+4%2A%28+5+%2B+1%2F3+%29+=+20+%2B+4%2F3+\"$
\n" ); document.write( " $\"+20+%2B+4%2F3+=+21+%2B+1%2F3+\"$
\n" ); document.write( "OK \n" ); document.write( "

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