document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=252695>Question 252695</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There are 60 red marbles  and 40 blue marbles in a  bag. How many blue  marbles must be added so  that the probability of  drawing blue is 75% ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #184721 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=184721\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> for a probability of 75%, 75% of the marbles must be blue.<BR>\n" );
document.write( "3/4 must be blue<BR>\n" );
document.write( "if there were 60 blue marbles the probability would be 50%<BR>\n" );
document.write( "if there were 120 blue marbles it would 66.7% or 2/3\r<BR>\n" );
document.write( "\n" );
document.write( "if 1/4 were red and 3/4 were blue then it would 75%<BR>\n" );
document.write( "1/4x=60<BR>\n" );
document.write( "x=240<BR>\n" );
document.write( "240-40 is 200<BR>\n" );
document.write( "so 200 more blue marbles are needed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );