document.write( "Question 1026736: Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark? \n" ); document.write( "
Algebra.Com's Answer #642025 by ikleyn(52809)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark?
\n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%2855-15%29%2F2\" = 20.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );