document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=864996>Question 864996</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 5. A bag contains four blue marbles, five green marbles, and three yellow marbles. How many blue marbles should you add to the bag so that the probability of drawing a blue marble is 0.80? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #521422 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=521422\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A bag contains four blue marbles, five green marbles, and three yellow marbles. How many blue marbles should you add to the bag so that the probability of drawing a blue marble is 0.80?<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "# of ways to succeed:: 4+x<BR>\n" );
document.write( "# of possible choices:: (4+5+3+x)<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "(4+x)/(12+x) = 0.8<BR>\n" );
document.write( "4+x = 0.8(12+x)<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "4+x = 9.6 + 0.8x<BR>\n" );
document.write( "0.2x = 5.6<BR>\n" );
document.write( "2x = 56<BR>\n" );
document.write( "x = 28 (# of blue to add)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Why?<BR>\n" );
document.write( "(4+28)/(12+28) = 32/40 = 4/5 = 0.8<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "------------------ </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );