document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=87499>Question 87499</A>: <I><SPAN STYLE=\"word-break: break-all;\"> S  is 1/4 if the age of father. in 12 years he will be  2/5 of the age of father so what is their ages now?\r<BR>\n" );
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document.write( "please show me the equations to solve. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #63420 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=63420\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let S = age of S and F = age of father.<BR>\n" );
document.write( "1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+%281%2F4%29F ALIGN=MIDDLE  ALT=\"S+=+%281%2F4%29F\"   DISABLED_style= \"max-width:90%; height:auto;\" > \"S is 1/4 of the age of father\".<BR>\n" );
document.write( "2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S%2B12+=+%282%2F5%29%28F%2B12%29 ALIGN=MIDDLE  ALT=\"S%2B12+=+%282%2F5%29%28F%2B12%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > \"In 12 years (S+12) he will be 2/5 of the age of father (F+12)\".<BR>\n" );
document.write( "Substitute the S from eqation 1) into equation 2) and solve for F.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2F4%29F%2B12+=+%282%2F5%29%28F%2B12%29 ALIGN=MIDDLE  ALT=\"%281%2F4%29F%2B12+=+%282%2F5%29%28F%2B12%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Simplify.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28F%2F4%29%2B12+=+%282F%2F5%29%2B24%2F5 ALIGN=MIDDLE  ALT=\"%28F%2F4%29%2B12+=+%282F%2F5%29%2B24%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" > Multiply through by the LCD of 20 to clear the fractions.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5F%2B240+=+8F%2B96 ALIGN=MIDDLE  ALT=\"5F%2B240+=+8F%2B96\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 5F from both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=240+=+3F%2B96 ALIGN=MIDDLE  ALT=\"240+=+3F%2B96\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 96 from both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=144+=+3F ALIGN=MIDDLE  ALT=\"144+=+3F\"   DISABLED_style= \"max-width:90%; height:auto;\" > Finally, divide both sides by 3.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=48+=+F ALIGN=MIDDLE  ALT=\"48+=+F\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So, Father's present age is 48 years.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+%281%2F4%29F ALIGN=MIDDLE  ALT=\"S+=+%281%2F4%29F\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+%281%2F4%2948 ALIGN=MIDDLE  ALT=\"S+=+%281%2F4%2948\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+12 ALIGN=MIDDLE  ALT=\"S+=+12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So, S's present age is 12 years. </SPAN>\n" );
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