document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=351137>Question 351137</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This is a mathematics problem which one of my cousin asked me yesterday.   He is in grade 4. However, I cannot help him because I am not good in maths.\r<BR>\n" );
document.write( "\n" );
document.write( "The width of a rectangle  is  20  cm  more than  half the length.<BR>\n" );
document.write( "Its area  is   4800 sq.cm.<BR>\n" );
document.write( "Find its width. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #250975 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=250975\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The width of a rectangle is 20 cm more than half the length.<BR>\n" );
document.write( "Its area is 4800 sq.cm.<BR>\n" );
document.write( "Find its width.<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Let the length be \"2x\".<BR>\n" );
document.write( "Then the width is \"x+20\".<BR>\n" );
document.write( "------------------------------<BR>\n" );
document.write( "Area = length * width<BR>\n" );
document.write( "---<BR>\n" );
document.write( "4800 = (2x)(x+20)<BR>\n" );
document.write( "4800 = 2x^2+40x<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Rearrange to get:<BR>\n" );
document.write( "2x^2+40x-4800 = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Divide thru by 2 to get:<BR>\n" );
document.write( "x^2 + 20x - 2400 = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Factor to get:<BR>\n" );
document.write( "(x-40)(x+60) = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Positive solution:<BR>\n" );
document.write( "x = 40<BR>\n" );
document.write( "width = x+20 = 40+20 = 60 ft.<BR>\n" );
document.write( "=======================<BR>\n" );
document.write( "Comment:  That is a pretty tough problem<BR>\n" );
document.write( "for a 4th grader.  Your cousin must be at<BR>\n" );
document.write( "an advanced level in math.  Congratulations.<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" );