document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1030570>Question 1030570</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boy is 12 years older than his sister. If in 4 years time he is twice her age, what are their current ages? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #645412 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=645412\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi there,<BR>\n" );
document.write( "A boy is 12 years older than his sister<BR>\n" );
document.write( "B = 12 + S.........(10<BR>\n" );
document.write( "If in 4 years time he is twice her age<BR>\n" );
document.write( "B + 4 = 2(S + 4)<BR>\n" );
document.write( "Replace B in Eq(2) with (12 + S) from Eq(1)<BR>\n" );
document.write( "12+ S + 4 = 2S + 8<BR>\n" );
document.write( "Collect like terms<BR>\n" );
document.write( "2S - S = 12 + 4 - 8<BR>\n" );
document.write( "S = 8<BR>\n" );
document.write( "Sister is 8 years old<BR>\n" );
document.write( "Brother is 20 years old<BR>\n" );
document.write( "Hope this helps :-) </SPAN>\n" );
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