document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1020663>Question 1020663</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A father said to his son, When I was your age, you were 2 years old. His son replies, When I reach your age, you will be 68 years old. What is the father's 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 #636595 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=636595\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+ ALIGN=MIDDLE  ALT=\"+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the son's age now<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f+ ALIGN=MIDDLE  ALT=\"+f+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the father's age now<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f+-+s+ ALIGN=MIDDLE  ALT=\"+f+-+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the difference in their ages<BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "When the son was 2, the father was:<BR>\n" );
document.write( "2 + [ the difference in their ages ]<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2+%2B+f+-+s+ ALIGN=MIDDLE  ALT=\"+2+%2B+f+-+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "That was when the father was <BR>\n" );
document.write( "the son's present age, so<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+2+%2B+f+-+s+ ALIGN=MIDDLE  ALT=\"+s+=+2+%2B+f+-+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2s+-+f+=+2+ ALIGN=MIDDLE  ALT=\"+2s+-+f+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "When the father is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+68+ ALIGN=MIDDLE  ALT=\"+68+\"   DISABLED_style= \"max-width:90%; height:auto;\" >,<BR>\n" );
document.write( "then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+68+ ALIGN=MIDDLE  ALT=\"+68+\"   DISABLED_style= \"max-width:90%; height:auto;\" > - [ the difference in their ages ] = <BR>\n" );
document.write( "\" your age \" which is the father's present age, so<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f+=+68+-+%28+f+-+s+%29+ ALIGN=MIDDLE  ALT=\"+f+=+68+-+%28+f+-+s+%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+=+68+-+f+%2B+s+ ALIGN=MIDDLE  ALT=\"+f+=+68+-+f+%2B+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-s+%2B+2f+=+68+ ALIGN=MIDDLE  ALT=\"+-s+%2B+2f+=+68+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "Multiply both sides of (1) by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2+ ALIGN=MIDDLE  ALT=\"+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > and add the equations<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4s+-+2f+=+4+ ALIGN=MIDDLE  ALT=\"+4s+-+2f+=+4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-s+%2B+2f+=+68+ ALIGN=MIDDLE  ALT=\"+-s+%2B+2f+=+68+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3s+=+72+ ALIGN=MIDDLE  ALT=\"+3s+=+72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+24+ ALIGN=MIDDLE  ALT=\"+s+=+24+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2s+-+f+=+2+ ALIGN=MIDDLE  ALT=\"+2s+-+f+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2%2A24+-+f+=+2+ ALIGN=MIDDLE  ALT=\"+2%2A24+-+f+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f+=+48+-+2+ ALIGN=MIDDLE  ALT=\"+f+=+48+-+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f+=+46+ ALIGN=MIDDLE  ALT=\"+f+=+46+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "The father's present age is 46<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "The difference in their ages is: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+46+-+24+=+22+ ALIGN=MIDDLE  ALT=\"+46+-+24+=+22+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "\"A father said to his son, When I was your age,\"<BR>\n" );
document.write( "when the fathers was: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+24+ ALIGN=MIDDLE  ALT=\"+24+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "\" you were 2 years old.\"<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+24+-+22+=+2+ ALIGN=MIDDLE  ALT=\"+24+-+22+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > OK<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "\"When I reach your age, \"<BR>\n" );
document.write( "when the son is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+46 ALIGN=MIDDLE  ALT=\"+46\"   DISABLED_style= \"max-width:90%; height:auto;\" >,<BR>\n" );
document.write( "The father will be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+46+%2B+22+=+68+ ALIGN=MIDDLE  ALT=\"+46+%2B+22+=+68+\"   DISABLED_style= \"max-width:90%; height:auto;\" > OK </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );