document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=23849>Question 23849</A>: <I><SPAN STYLE=\"word-break: break-all;\"> PlEASE help! A postal clerk sold some fifteen-cent stamps and some twenty-five cent stamps. Altogether, 10 stamps were sold for a total cost of $1.70. How many of each type of stamp were sold? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #12579 by </B><A HREF=/tutors/aboutme.mpl?userid=Paul><B>Paul(988)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Paul><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=12579\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the $0.15 stamps be x<BR>\n" );
document.write( "Let the $0.20 stamps be y<BR>\n" );
document.write( "x+y=10<BR>\n" );
document.write( "y=10-x\r<BR>\n" );
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document.write( "SInce I do not like working with demicals I'll convert them to integers by multiplying the numbers by 100.<BR>\n" );
document.write( "So:<BR>\n" );
document.write( "15x+20y=170 (subsituite the known value)<BR>\n" );
document.write( "15x+20(10-x)=170<BR>\n" );
document.write( "15x+200-20x=170<BR>\n" );
document.write( "-5x=-30<BR>\n" );
document.write( "x=6\r<BR>\n" );
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document.write( "y=10-6<BR>\n" );
document.write( "y=4<BR>\n" );
document.write( "Hence for $0.15 about 6 stamps were sold and for $0.20 about 4 stamps were sold. </SPAN>\n" );
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