document.write( "Question 488780: a man is three times as old as his son. four years ago, he was four times as old as his son was at that time.how old is the son?\r
\n" ); document.write( "\n" ); document.write( "i think its twelve. i've done it in a trial and error way, but i need a solution..thank you^^
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Algebra.Com's Answer #333458 by dannia22(1)\"\" \"About 
You can put this solution on YOUR website!
4(x-4)=3x-4
\n" ); document.write( "4x-16=3x-4
\n" ); document.write( "4x-3x=-4+16
\n" ); document.write( "x=12\r
\n" ); document.write( "\n" ); document.write( "thank you^^
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