document.write( "Question 510937: Matthew is 3 times as old as Jenny. In 7 years he will be twice as old as she will be then. How old is each now.
\n" ); document.write( "I have figured out the answer, but not how to work the problem. I tried:
\n" ); document.write( "x + 1/3X = 2 times X + 7 + 1/3 X + 7 which is completely wrong. I have not done a problen where I didn't have a specific number for an answer. Reid
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Algebra.Com's Answer #341940 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Matthew is 3 times as old as Jenny.
\n" ); document.write( "m = 3j
\n" ); document.write( " In 7 years he will be twice as old as she will be then.
\n" ); document.write( "m + 7 = 2(j+7)
\n" ); document.write( "m + 7 = 2j + 14
\n" ); document.write( "m = 2j + 14 - 7
\n" ); document.write( "m = 2j + 7
\n" ); document.write( "Replace m with 3j
\n" ); document.write( "3j = 2j + 7
\n" ); document.write( "3j - 2j = 7
\n" ); document.write( "j = 7 yrs
\n" ); document.write( "then obviously
\n" ); document.write( "m = 21 yrs\r
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