document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=552094>Question 552094</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The age of the father will be five times the age of his son in five years time. If the sum of their ages now is 80 years. Calculate the present age of the father. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #360108 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=360108\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The age of the father will be five times the age of his son in five years time. If the sum of their ages now is 80 years. Calculate the present age of the father.<BR>\n" );
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document.write( "Let f = the father's present age<BR>\n" );
document.write( "Let s = the son's present age<BR>\n" );
document.write( "Given: in 5 years the father will be 5 times as old as the son; sum of their ages is 80<BR>\n" );
document.write( "Put this information in equation form:<BR>\n" );
document.write( "f + 5 = 5(s + 5)<BR>\n" );
document.write( "f + s = 80 -> s = 80 - f<BR>\n" );
document.write( "f + 5 = 5((80 - f) + 5)<BR>\n" );
document.write( "Solve for f:<BR>\n" );
document.write( "f + 5 = 425 - 5f<BR>\n" );
document.write( "6f = 420<BR>\n" );
document.write( "f = 70<BR>\n" );
document.write( "So the father is 70 years old </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );