document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=661568>Question 661568</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mark is 60 years younger than Danielle. 3 years ago, Danielle's age was 4 times Mark's age. How old is Mark now?<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 #411686 by </B><A HREF=/tutors/aboutme.mpl?userid=MathTherapy><B>MathTherapy(10552)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathTherapy><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=MathTherapy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=411686\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mark is 60 years younger than Danielle. 3 years ago, Danielle's age was 4 times Mark's age. How old is Mark now?\r<BR>\n" );
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document.write( "Let Danielle's current age be D, and Mark's, M<BR>\n" );
document.write( "Then: M = D - 60 ---- D = M + 60 ----- eq (i)\r<BR>\n" );
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document.write( "Also, D - 3 = 4(M - 3) ---- D - 3 = 4M - 12 ---- D - 4M = - 9 ---- eq (ii)\r<BR>\n" );
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document.write( "M + 60 - 4M = - 9 ------- Substituting M + 60 for D in eq (ii)<BR>\n" );
document.write( "- 3M = - 69\r<BR>\n" );
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document.write( "M, or Mark's current age = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-+69%29%2F-+3 ALIGN=MIDDLE  ALT=\"%28-+69%29%2F-+3\"   DISABLED_style= \"max-width:90%; height:auto;\" >, or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%2823%29 ALIGN=MIDDLE  ALT=\"highlight_green%2823%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "You can do the check!!\r<BR>\n" );
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document.write( "Send comments and “thank-yous” to “D” at MathMadEzy@aol.com  </SPAN>\n" );
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