document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=920010>Question 920010</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I really don't know know if this type of question belongs in this category. BDW, here's my question. <BR>\n" );
document.write( " Zildijian's friends gave her a gift costing P240 for her sixteenth birthday. If four more friends had contributed, the cost of each would be P3 less. How many friends bought the gift? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #558104 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=558104\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> n the number of friends buying the gift<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=240%2Fn+-+240%2F%28n%2B4%29 ALIGN=MIDDLE  ALT=\"240%2Fn+-+240%2F%28n%2B4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = P3  |Multiplying thru by n(n+4) so as all denominators = 1<BR>\n" );
document.write( "240(n+4) - 240n = 3n(n+4)<BR>\n" );
document.write( "3n^2 + 12n - 960 = 0<BR>\n" );
document.write( "n^2 + 4n - 320 = 0  (Tossing out the negative solution for unit measure)<BR>\n" );
document.write( "(n+20)(n-16) = 0<BR>\n" );
document.write( "n = 16 friends bought a gift<BR>\n" );
document.write( "and...checking<BR>\n" );
document.write( "240/16 - 240/20 = P15 - P12 = P3 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );