document.write( "Question 259853: mary is three times as old as her son .after twelvue years she is one year less than twice her sons age. what are there present ages.? \n" ); document.write( "
Algebra.Com's Answer #191326 by drk(1908)\"\" \"About 
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Let m = mary, and s = son.
\n" ); document.write( "From above, we get
\n" ); document.write( "m = 3s
\n" ); document.write( "m+12 = 2(s+12) - 1
\n" ); document.write( "By substitution, we get
\n" ); document.write( "3s + 12 = 2s + 23
\n" ); document.write( "s = 11
\n" ); document.write( "m = 33
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