document.write( "Question 840503: a father is 4 times as old as his son.in 10 years he will be twice as old .how old is the father at the present ? \n" ); document.write( "
Algebra.Com's Answer #506252 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
f=4s,
\n" ); document.write( "f+10=2*(s+10)
\n" ); document.write( "f+10=2s+20
\n" ); document.write( "4s+10=2s+20
\n" ); document.write( "2s=10
\n" ); document.write( "x=5
\n" ); document.write( "f=20
\n" ); document.write( "That means the guy became a father at age 15
\n" ); document.write( "Disgusting!
\n" ); document.write( "
\n" ); document.write( "
\n" );