document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1157205>Question 1157205</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boy is one-fifth of his father's age. In 3years time the sum of the boy's and father's age is 72. What is the age of both of them </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #780043 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=780043\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Using logical reasoning and some simple mental arithmetic, instead of formal algebra (if a formal algebraic solution is not required!)...<br><BR>\n" );
document.write( "The boy is 1/5 of his father's age --> the boy is 1/6 of the SUM of their ages; the father is 5/6 of the SUM.<br><BR>\n" );
document.write( "The sum of their ages 3 years from now is 72 --> the sum of their ages now is 72-2*3 = 66.<br><BR>\n" );
document.write( "The son's age is 1/6 of 66, which is 11; the father is 5/6 of 66, which is 55.<br><BR>\n" );
document.write( "ANSWERS: 11 and 55<br><BR>\n" );
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