document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1043635>Question 1043635</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mr.  Lee brought reading books to his class.  If each student takes 5 books.  there will be 15 books left.  If 5 students do not take a book and the rest of the students take 7 books each,  there will be no books left.  How many books were brought to the class? <BR>\n" );
document.write( " A)  140 B)  125 C)  120 D)  104 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #658773 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=658773\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x books were brought to class.<BR>\n" );
document.write( "y=number of students in the class.<BR>\n" );
document.write( "x-5y=15<BR>\n" );
document.write( "x-7(y-5)=0.  This means that 5 fewer than y students each took 7 books.<BR>\n" );
document.write( "Therefore, x=7(y-5)<BR>\n" );
document.write( "Substitute into first equation.<BR>\n" );
document.write( "7(y-5)-5y=15<BR>\n" );
document.write( "7y-35-5y=15<BR>\n" );
document.write( "2y=50<BR>\n" );
document.write( "y=25<BR>\n" );
document.write( "x-125=15<BR>\n" );
document.write( "x=140 books.  A<BR>\n" );
document.write( "There are 25 students.<BR>\n" );
document.write( "If each student takes 5 books, 125 are taken and 15 are left<BR>\n" );
document.write( "If 20 students (5 fewer than 25) take 7 books, none is left. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );