document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=611414>Question 611414</A>: <I><SPAN STYLE=\"word-break: break-all;\"> mark is 11 years older then his sister. in eight years he will be twice as old as she will be. how old are they now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #384954 by </B><A HREF=/tutors/aboutme.mpl?userid=radh><B>radh(108)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=radh><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=radh><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=384954\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let's write this mathematically. We'll represent age by x.<BR>\n" );
document.write( "Mark is 11 years older than his sister (11+x). In eight years (+8) he will be twice as old as his sister (2x).<BR>\n" );
document.write( "So, it'd be: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x%2B8=11%2Bx ALIGN=MIDDLE  ALT=\"2x%2B8=11%2Bx\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Let's simplify that: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=simplify_cartoon%28+2%2Ax%2B8=11%2Bx+%29 ALIGN=MIDDLE  ALT=\"simplify_cartoon%28+2%2Ax%2B8=11%2Bx+%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now we know that x=3, so we plug it back into the original formula: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=11%2B3 ALIGN=MIDDLE  ALT=\"11%2B3\"   DISABLED_style= \"max-width:90%; height:auto;\" >, so Mark is 14 and his sister is 3. :) </SPAN>\n" );
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