document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=603942>Question 603942</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Juana bought 16 used paperback books for $10.95.  Some cost $.60 and the rest cost $.75 each.  How many of each did she buy? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #380890 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=380890\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Juana bought 16 used paperback books for $10.95. Some cost $.60 and the rest cost $.75 each. How many of each did she buy?<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "a + b = 16<BR>\n" );
document.write( "0.6a + 0.75b = 10.95<BR>\n" );
document.write( "------<BR>\n" );
document.write( "a + b = 16<BR>\n" );
document.write( "60a + 75b = 1095<BR>\n" );
document.write( "----------<BR>\n" );
document.write( "a = 16-b<BR>\n" );
document.write( "12a + 15b = 219<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Substitute for \"a\" and solve for \"b\":<BR>\n" );
document.write( "12(16-b) + 15b = 219<BR>\n" );
document.write( "192 - 12b + 15b = 219<BR>\n" );
document.write( "3b = 27<BR>\n" );
document.write( "b = 9 (# of 0.60 books)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "a = 16-9 = 7 (# of 0.75 books)<BR>\n" );
document.write( "===================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============= </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );