document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=182721>Question 182721</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Alfred is twice as old as his brother. Four years ago he was four times as old. How old is Alfred now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #137192 by </B><A HREF=/tutors/aboutme.mpl?userid=Mathtut><B>Mathtut(3670)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Mathtut><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=137192\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Alfred is twice as old as his brother. Four years ago he was four times as old. How old is Alfred now?\r<BR>\n" );
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document.write( "lets call the ages of alfred and brother, a and b , respectively<BR>\n" );
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document.write( "a=2b.......eq 1<BR>\n" );
document.write( "a-4=4(b-4).eq 2<BR>\n" );
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document.write( "take a's value of 2b from eq 1 and plug it into eq 2<BR>\n" );
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document.write( "2b-4=4(b-4)<BR>\n" );
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document.write( "2b-4=4b-16<BR>\n" );
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document.write( "2b=12<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28b=6%29 ALIGN=MIDDLE  ALT=\"highlight%28b=6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >age of brother<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28a=2%286%29=12%29 ALIGN=MIDDLE  ALT=\"highlight%28a=2%286%29=12%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >age of alfred </SPAN>\n" );
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