document.write( "Question 1156484: David and John's ages add up to twenty nine. Seven years ago David was twice the
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document.write( "age john. What are their present ages.
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Algebra.Com's Answer #779187 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! D+J=29 \n" ); document.write( "D-7=2(J-7) \n" ); document.write( "so D=2J-14+7=2J-7 \n" ); document.write( "so 2J-7+J=29 \n" ); document.write( "3J=36 \n" ); document.write( "J=12 \n" ); document.write( "D=17\r \n" ); document.write( "\n" ); document.write( "check 7 years ago they were 5 and 10. \n" ); document.write( " |