document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=551536>Question 551536</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A student makes a$9.25 purchase at the book store with $20 bill. The store has no bills, the change is in quarters and fifty cent pieces. There are 30 coins. How many is quarters and how many fifty cent pieces?<BR>\n" );
document.write( "A disc jockey must play 12 commercial spots during 1 hr. of a radio show. Each comm. is either 30 sec. or 60 sec. long. If the total comm. time during 1 hr. is 8 min, How many 30 sec. comm. were played that hour? How many 60sec. comm? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #359761 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=359761\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Quarters			x	numbers					<BR>\n" );
document.write( "fifty cent coins			y	numbers					<BR>\n" );
document.write( "									<BR>\n" );
document.write( "1	x	+	1	y	=	30	.............1		<BR>\n" );
document.write( "25	x	+	50	y	=	1075	.............2		<BR>\n" );
document.write( "Eliminate y									<BR>\n" );
document.write( "multiply (1)by 		-50							<BR>\n" );
document.write( "Multiply (2) by		1							<BR>\n" );
document.write( "-50	x		-50	y	=	-1500			<BR>\n" );
document.write( "25	x		50	y	=	1075			<BR>\n" );
document.write( "Add the two equations									<BR>\n" );
document.write( "-25	x				=	-425			<BR>\n" );
document.write( "/	-25								<BR>\n" );
document.write( "x	=	17				<BR>\n" );
document.write( "plug value of 			x	in (1)					<BR>\n" );
document.write( "1	x	+	1	y	=	30			<BR>\n" );
document.write( "17		+	1	y	=	30			<BR>\n" );
document.write( "			1	y	=	30		-17	<BR>\n" );
document.write( "			1	y	=	13			<BR>\n" );
document.write( "				y	=	13<BR>\n" );
document.write( "Quarters			17    	numbers					<BR>\n" );
document.write( "fifty cent coins			13    	numbers		\r<BR>\n" );
document.write( "\n" );
document.write( "------------\r<BR>\n" );
document.write( "\n" );
document.write( "30 sec comm			x	numbers					<BR>\n" );
document.write( "60 sec comm			y	numbers					<BR>\n" );
document.write( "									<BR>\n" );
document.write( "1	x	+	1	y	=	12	.............1		<BR>\n" );
document.write( "30	x	+	60	y	=	480	.............2		<BR>\n" );
document.write( "Eliminate y									<BR>\n" );
document.write( "multiply (1)by 		-60							<BR>\n" );
document.write( "Multiply (2) by		1							<BR>\n" );
document.write( "-60	x		-60	y	=	-720			<BR>\n" );
document.write( "30	x		60	y	=	480			<BR>\n" );
document.write( "Add the two equations									<BR>\n" );
document.write( "-30	x				=	-240			<BR>\n" );
document.write( "/	-30								<BR>\n" );
document.write( "x	=	8  				<BR>\n" );
document.write( "plug value of 			x	in (1)					<BR>\n" );
document.write( "1	x	+	1	y	=	12			<BR>\n" );
document.write( "8		+	1	y	=	12			<BR>\n" );
document.write( "			1	y	=	12		-8	<BR>\n" );
document.write( "			1	y	=	4			<BR>\n" );
document.write( "				y	=	4   <BR>\n" );
document.write( "30 sec comm			8    	numbers					<BR>\n" );
document.write( "60 sec comm			4    	numbers					\r<BR>\n" );
document.write( "\n" );
document.write( "			<BR>\n" );
document.write( "m.ananth@hotmail.ca									<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );