document.write( "Question 1155594: When Mary is twice as old as Frank, then I shall be 17 years old.\r
\n" ); document.write( "\n" ); document.write( "But Mary was 23 when Frank was twice as old as me.\r
\n" ); document.write( "\n" ); document.write( "That’s what John said.\r
\n" ); document.write( "\n" ); document.write( "How old was John when Frank was ten? \n" ); document.write( "
Algebra.Com's Answer #778192 by Boreal(15235)\"\" \"About 
You can put this solution on YOUR website!
=== M. F J
\n" ); document.write( " 2x. x. 17
\n" ); document.write( " 23. 2y. y\r
\n" ); document.write( "\n" ); document.write( "now 2x-23=x-2y
\n" ); document.write( "and x-2y=17-y\r
\n" ); document.write( "\n" ); document.write( "Therefore, x=23-2y
\n" ); document.write( "and x=17+y\r
\n" ); document.write( "\n" ); document.write( "so 17+y=23-2y
\n" ); document.write( "3y=6
\n" ); document.write( "y=2 x=19 and 2x=38\r
\n" ); document.write( "\n" ); document.write( "so it is 23 4 2
\n" ); document.write( "meaning that it is
\n" ); document.write( "38. 19 17
\n" ); document.write( "23 4. 2 \r
\n" ); document.write( "\n" ); document.write( "So when Frank was 10, John was 8 ANSWER\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );