document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=543176>Question 543176</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The age of a person is twice the sum of the ages of his two sons and five years ago his age was thrice the sum of their ages.find  his present age. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #355184 by </B><A HREF=/tutors/aboutme.mpl?userid=JBarnum><B>JBarnum(2146)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=JBarnum><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=JBarnum><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=355184\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f=father a=first son b=second son<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f=2%28a%2Bb%29 ALIGN=MIDDLE  ALT=\"f=2%28a%2Bb%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > this says father is 2 times the age of his two sons combined.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f-5=3%28%28a-5%29%2B%28b-5%29%29 ALIGN=MIDDLE  ALT=\"f-5=3%28%28a-5%29%2B%28b-5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > 5 years ago means you have to subtract 5 years from the father and 2 sons<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%28a%2Bb%29-5=3%28%28a-5%29%2B%28b-5%29%29 ALIGN=MIDDLE  ALT=\"2%28a%2Bb%29-5=3%28%28a-5%29%2B%28b-5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2a%2B2b-5=3a-15%2B3b-15 ALIGN=MIDDLE  ALT=\"2a%2B2b-5=3a-15%2B3b-15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-5=a%2Bb-30 ALIGN=MIDDLE  ALT=\"-5=a%2Bb-30\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=a%2Bb-25 ALIGN=MIDDLE  ALT=\"0=a%2Bb-25\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-a=b-25 ALIGN=MIDDLE  ALT=\"-a=b-25\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=25-b ALIGN=MIDDLE  ALT=\"a=25-b\"   DISABLED_style= \"max-width:90%; height:auto;\" > this tells us both a and b are less than 25 yrs old<BR>\n" );
document.write( "take this and substitute it for a in the first equation<BR>\n" );
document.write( ".<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f=2%28a%2Bb%29 ALIGN=MIDDLE  ALT=\"f=2%28a%2Bb%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f=2%28%2825-b%29%2Bb%29 ALIGN=MIDDLE  ALT=\"f=2%28%2825-b%29%2Bb%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > b will cancel out<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f=2%2825%29 ALIGN=MIDDLE  ALT=\"f=2%2825%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f=50 ALIGN=MIDDLE  ALT=\"f=50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".<BR>\n" );
document.write( "to check use the other equation <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f-5=3%28%28a-5%29%2B%28b-5%29%29 ALIGN=MIDDLE  ALT=\"f-5=3%28%28a-5%29%2B%28b-5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > sub f and a<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=50-5=3%28%28%2825-b%29-5%29%2B%28b-5%29%29 ALIGN=MIDDLE  ALT=\"50-5=3%28%28%2825-b%29-5%29%2B%28b-5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=45=3%2815%29 ALIGN=MIDDLE  ALT=\"45=3%2815%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=45=45 ALIGN=MIDDLE  ALT=\"45=45\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "correct </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );