document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1045646>Question 1045646</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A son is 3 years younger than his sister, who, in turn is 27 years younger than their mom. In 11 years their mom will be 3 times the age of the daughter. \r<BR>\n" );
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document.write( "How old the son at the present moment. \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 #661125 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=661125\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let a = son's present age<BR>\n" );
document.write( "let b = sister's<BR>\n" );
document.write( "let m = mom's<BR>\n" );
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document.write( "write an equation for each statement<BR>\n" );
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document.write( "A son is 3 years younger than his sister,<BR>\n" );
document.write( "a = b - 3<BR>\n" );
document.write( " who, in turn is 27 years younger than their mom.<BR>\n" );
document.write( "b = m - 27<BR>\n" );
document.write( " In 11 years their mom will be 3 times the age of the daughter.<BR>\n" );
document.write( "m + 11 = 3(b + 11)<BR>\n" );
document.write( "m + 11 = 3b + 33<BR>\n" );
document.write( "m = 3b + 33 - 11<BR>\n" );
document.write( "m = 3b + 22<BR>\n" );
document.write( "replace b with (m-27) from the 2nd statement<BR>\n" );
document.write( "m = 3(m-27) + 22<BR>\n" );
document.write( "m = 3m - 81 + 22<BR>\n" );
document.write( "m = 3m - 59<BR>\n" );
document.write( "59 = 3m - m<BR>\n" );
document.write( "59 = 2m<BR>\n" );
document.write( "m = 59/2<BR>\n" );
document.write( "m = 29.5, not an integer so this problem is probably not valid<BR>\n" );
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document.write( "but plunging ahead anyway<BR>\n" );
document.write( "b = 29.5 - 27<BR>\n" );
document.write( "b = 2.5<BR>\n" );
document.write( "therefore, son's age<BR>\n" );
document.write( "a = 2.5 - 3<BR>\n" );
document.write( "a = -.5, obviously a major flaw in the this problem<BR>\n" );
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document.write( "How old the son at the present moment. Will be born in 6 months<BR>\n" );
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document.write( "maybe the method will help you in future problems like this. CK  </SPAN>\n" );
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