document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=718117>Question 718117</A>: <I><SPAN STYLE=\"word-break: break-all;\"> mary has 54 coins which are either 20-cent coins or 50-cent coins.If the total amount is $20.70, how many 20-cent coins does Mary have? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #440753 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley79><B>checkley79(3341)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley79><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=440753\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> X+Y=54<BR>\n" );
document.write( "X=54-Y<BR>\n" );
document.write( ".20X+.50Y=20.70<BR>\n" );
document.write( ".20(54-Y)+.50Y=20.70<BR>\n" );
document.write( "10.80-.20Y+.50Y=20.70<BR>\n" );
document.write( ".30Y=20.70-10.80<BR>\n" );
document.write( ".30Y=9.90<BR>\n" );
document.write( "Y=9.90/.30<BR>\n" );
document.write( "Y=33 50-CENT COINS.<BR>\n" );
document.write( "X+33=54<BR>\n" );
document.write( "X=54-33<BR>\n" );
document.write( "X=21 20-CENT COINS.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( ".20*21+.50*33=20.70<BR>\n" );
document.write( "4.20+16.50=20-70<BR>\n" );
document.write( "20.70=20.70<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );