document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=732023>Question 732023</A>: <I><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "A is 27 years old. B is one third older. How many years ago was the ratio of A's age to B's age equal to 4:7? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #447488 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley79><B>checkley79(3341)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley79><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=447488\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 4/7=(A-X)/(B-X)<BR>\n" );
document.write( "4/7=(27-X)/(27+9-X) CROSS MULTIPLY.<BR>\n" );
document.write( "7(27-X)=4(36-X)<BR>\n" );
document.write( "189-7X=144-4X<BR>\n" );
document.write( "-7X+4X=144-189<BR>\n" );
document.write( "-3X=-45<BR>\n" );
document.write( "X=-45/-3<BR>\n" );
document.write( "X=15 YEARS AGE THEIR AGES WERE 4:7<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "(27-15)/(36-15)<BR>\n" );
document.write( "12/21=4/7<BR>\n" );
document.write( "12*7=21*4<BR>\n" );
document.write( "84=84<BR>\n" );
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