document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1181289>Question 1181289</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The freshman class treasury has 30 ten- and twenty-dollar bills that have a total value of $430. How many of each bill do they have? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #811170 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13209)</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=811170\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "A quick and easy mental solution, if formal algebra is not required....<br><BR>\n" );
document.write( "(1) Imagine having 30 bills that were all $10 bills.  The total would be $300, which is $130 less than the actual total.<BR>\n" );
document.write( "(2) Exchanging a $10 bill for a $20 bill keeps the total number of bills the same but increases the total value by $20-$10=$10.<BR>\n" );
document.write( "(3) The number of exchanges needed to make up that additional $130 is $130/$10=13.<br><BR>\n" );
document.write( "So 13 $10 bills were exchanged for $20 bills, leaving you with 13 $20 bills and 30-13=17 $10 bills.<br><BR>\n" );
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