document.write( "Question 456609: my father is 21 years older than me, after a time period of 12 years his age is twice of my age. how old am i ? \n" ); document.write( "
Algebra.Com's Answer #313343 by stanbon(75887)\"\" \"About 
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my father is 21 years older than me, after a time period of 12 years his age is twice of my age. how old am i ?
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\n" ); document.write( "Equations:
\n" ); document.write( "f = m + 21
\n" ); document.write( "(f+12)=2(m+12)
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\n" ); document.write( "Substitute for \"f\" and solve for \"m\":
\n" ); document.write( "(m+21+12) = 2m+24
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\n" ); document.write( "m = 9 yrs (\"me's\" age now)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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