document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=979969>Question 979969</A>: <I><SPAN STYLE=\"word-break: break-all;\"> there is a stack of folders. the probability of drawing out a yellow folder from the stack is 7/12. after 18 yellow folders are taken out, the probability of drawing out a yellow folder now is 4/9. how many yellow folders are there initially?\r<BR>\n" );
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document.write( "there are 9 girls in a team. if 6 boys joined the team, then the probability of choosing a boy from the team is 4/7. what is the probability of choosing a boy from the team before the six boys join the team?\r<BR>\n" );
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document.write( "the probability of drawing a yellow marble from a bag with 42 marbles is 2/3. how many orange marbles should be taken away to have the probability of drawing a yellow marble from the bag to be 14/15? \r<BR>\n" );
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document.write( "there are 45 coins in a jar. the probability of drawing a coin randomly that is not a dime is 11/15. how many nickels should be added to have the probability of drawing a dime to be 2/9?\r<BR>\n" );
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document.write( "PLEASE EXPLAIN THANK YOU!!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #601337 by </B><A HREF=/tutors/aboutme.mpl?userid=onlinepsa><B>onlinepsa(22)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=onlinepsa><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=onlinepsa><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=601337\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Q> There is a stack of folders. the probability of drawing out a yellow folder from the stack is 7/12. after 18 yellow folders are taken out, the probability of drawing out a yellow folder now is 4/9. how many yellow folders are there initially? \r<BR>\n" );
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document.write( "A> Let us consider there are total 12x folders out of which 7x are yellow.\r<BR>\n" );
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document.write( "Now, 18 yellow folders are taken out; remaining yellow folders= 7x-18.<BR>\n" );
document.write( "Remaining total folders= 12x-18\r<BR>\n" );
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document.write( "Now the probability of a yellow folder is given as (7x-18)/(12x-18).\r<BR>\n" );
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document.write( "Thus, (7x-18)/(12x-18) = 4/9\r<BR>\n" );
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document.write( "=> 63x-162=48x - 72<BR>\n" );
document.write( "=>15x=90<BR>\n" );
document.write( "=> x= 6.\r<BR>\n" );
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document.write( "Initially there are 7x or 42 folders.\r<BR>\n" );
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document.write( "Thanks,<BR>\n" );
document.write( "PRD<BR>\n" );
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