document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=612869>Question 612869</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An urn contains blue and purple marbles.  The number of purple marbles is 3 more than twice the number of blue marbles.  If the probability of drawing a blue marble at random is 1/4, how many  blue marbles are in the urn?\r<BR>\n" );
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document.write( "Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #385756 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=385756\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An urn contains blue and purple marbles. The number of purple marbles is 3 more than twice the number of blue marbles. If the probability of drawing a blue marble at random is 1/4, how many blue marbles are in the urn? <BR>\n" );
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document.write( "Equations:<BR>\n" );
document.write( "p = 2b + 3<BR>\n" );
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document.write( "b/[b + p] = 1/4<BR>\n" );
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document.write( "b/[b + 2b+3] = 1/4<BR>\n" );
document.write( "4b = 3b+3<BR>\n" );
document.write( "b = 3 (# of blue marbles)<BR>\n" );
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document.write( "Solve for \"p\":<BR>\n" );
document.write( "p = 2b + 3<BR>\n" );
document.write( "p = 2*3+3 = 9 (# of purple marbles)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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