document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=901128>Question 901128</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The sum of the ages of Mark and Linda is 114 years. 7 years ago, Mark's age was 4 times Linda's age. How old is Mark now?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #546537 by </B><A HREF=/tutors/aboutme.mpl?userid=JulietG><B>JulietG(1812)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=JulietG><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=JulietG><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=546537\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> M + L = 114<BR>\n" );
document.write( "M-7 = 4(L-7)<BR>\n" );
document.write( "Distribute<BR>\n" );
document.write( "M-7 = 4L-28<BR>\n" );
document.write( "Add 7 to each side<BR>\n" );
document.write( "M = 4L-21<BR>\n" );
document.write( "Take that value and substitute it into the first equation<BR>\n" );
document.write( "M + L = 114<BR>\n" );
document.write( "(4L-21)+L = 114<BR>\n" );
document.write( "5L-21 = 114<BR>\n" );
document.write( "Add 21 to each side<BR>\n" );
document.write( "5L = 135<BR>\n" );
document.write( "Divide each side by 5<BR>\n" );
document.write( "L = 27<BR>\n" );
document.write( "If Linda is 27, then Mark is 114-27, or 87.<br><BR>\n" );
document.write( "Prove it:<BR>\n" );
document.write( "<i>7 years ago, Mark's age was 4 times Linda's age</i><BR>\n" );
document.write( "7 years ago, Mark would have been 87-7, or 80 years old<BR>\n" );
document.write( "7 years ago, Linda would have been 27-7, or 20 years old<BR>\n" );
document.write( "80 years old is 4 times as old as 20.<BR>\n" );
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