document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=401587>Question 401587</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ann's age is seven-tenths of Bill's age. In 4 years Ann's age will be eight-elevenths of Bill's age. How old is Bill now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #284168 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=284168\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Ann's age is seven-tenths of Bill's age. In 4 years Ann's age will be eight-elevenths of Bill's age. How old is Bill now?<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "a = 0.7b<BR>\n" );
document.write( "(a+4) = (8/11)(b+4)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Substitute for a and solve for \"b\":<BR>\n" );
document.write( "(7/10)b+4) = (8/11)b + (32/11)<BR>\n" );
document.write( "Multiply thru by 110:<BR>\n" );
document.write( "77b + 440 = 80b + 320<BR>\n" );
document.write( "3b = 120<BR>\n" );
document.write( "b = 40<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Solve for \"a\":<BR>\n" );
document.write( "a = (7/10)b<BR>\n" );
document.write( "a = (7/10)40<BR>\n" );
document.write( "a = 28<BR>\n" );
document.write( "============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "==============<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );