document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=132371>Question 132371</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A family consists of a father, mother and some children. The mean age of the family is 18 years. Without the 38 year old father the mean age of the family decreases to only 14. How many children are there in the family? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #96732 by </B><A HREF=/tutors/aboutme.mpl?userid=oscargut><B>oscargut(2103)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oscargut><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=oscargut><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=96732\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let take n=number of children<BR>\n" );
document.write( "    h= sum of the ages of mother and children<BR>\n" );
document.write( "then\r<BR>\n" );
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document.write( "(38+h)/(n+2) = 18<BR>\n" );
document.write( "h/n+1 = 14<BR>\n" );
document.write( "then<BR>\n" );
document.write( "h=14(n+1)<BR>\n" );
document.write( "then<BR>\n" );
document.write( "38+14(n+1)=18(n+2)<BR>\n" );
document.write( "then\r<BR>\n" );
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document.write( "38+14+14n=18n+36<BR>\n" );
document.write( "-4n=-16<BR>\n" );
document.write( "then<BR>\n" );
document.write( "n=4\r<BR>\n" );
document.write( "\n" );
document.write( "R: there are 4 children in the family\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );