document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=257155>Question 257155</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When mineral deposits formed a coating 1mm thick on the inside of a pipe, the area through which fluid can flow was reduced by 20%. Find the original inside diameter of the pipe </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #189113 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=189113\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> pi*d=C<BR>\n" );
document.write( "Let d=original inside diameter of the pipe<BR>\n" );
document.write( ".8C=pi(d-.002)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "=>C=pi*d<BR>\n" );
document.write( ".8C=pi*d-.002*pi<BR>\n" );
document.write( "--------------------------subtract<BR>\n" );
document.write( ".2C=.002*pi<BR>\n" );
document.write( ".<BR>\n" );
document.write( "C=.01*pi <BR>\n" );
document.write( "pi*d=.01*pi<BR>\n" );
document.write( "d=.01 m or 1 cm<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );