document.write( "Question 693892: Kim is 15. Kim's father is 39. In how many years will Kim's father be exactly twice as old as Kim will be? \n" ); document.write( "

Algebra.Com's Answer #427619 by Stitch(470) $\"\"$ $\"About$

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Start by writing the equation: $\"2%2A%2815+%2B+X%29+=+39+%2B+X\"$
\n" ); document.write( "Simplify
\n" ); document.write( " $\"30+%2B+2X+=+39+%2B+X\"$
\n" ); document.write( "Subtract 30 from both sides
\n" ); document.write( " $\"2X+=+9+%2B+X\"$
\n" ); document.write( "Subtract X from both sides
\n" ); document.write( " $\"highlight%28X+=+9%29\"$
\n" ); document.write( "9 years \n" ); document.write( "

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