document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=930180>Question 930180</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A father has two sons whose age differ by 3 years. In 20 years time the sum of the son's ages will equal the father's age then. When the younger son was born, the father was nine times as old as his elder son. Find the present ages of the father and his two sons. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #564738 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=564738\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x = father age<BR>\n" );
document.write( "y = younger son age<BR>\n" );
document.write( "z = older son age<BR>\n" );
document.write( "---<BR>\n" );
document.write( "z - y = 3<BR>\n" );
document.write( "y + 20 + z + 20 = x + 20<BR>\n" );
document.write( "x - y = 9(z - y)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "put the system of linear equations into standard form<BR>\n" );
document.write( "---<BR>\n" );
document.write( "-y + z = 3<BR>\n" );
document.write( "x - y - z = 20<BR>\n" );
document.write( "x + 8y - 9z = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "copy and paste the above standard form linear equations in to this solver:<BR>\n" );
document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "solution:<BR>\n" );
document.write( "x = father age = 31<BR>\n" );
document.write( "y = younger son age = 4<BR>\n" );
document.write( "z = older son age = 7<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve and graph linear equations:<BR>\n" );
document.write( "https://sooeet.com/math/linear-equation-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve quadratic equations, quadratic formula:<BR>\n" );
document.write( "https://sooeet.com/math/quadratic-formula-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve systems of linear equations up to 6-equations 6-variables:<BR>\n" );
document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php<BR>\n" );
document.write( "--- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );