document.write( "Question 1101540: john's father is seven times as old as he is; one year ago his father was nine times as old as he is.find john's present age?
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #716148 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
j John
\n" ); document.write( "d \"dad\" or father\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"system%28d=7j%2Cd-1=9%28j-1%29%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"7j-1=9j-9\"
\n" ); document.write( "\"-1%2B9=2j\"
\n" ); document.write( "\"highlight%28j=4%29\"
\n" ); document.write( "
\n" );