Jul 16 03:00 PM PDT  04:00 PM PDT Join a free live webinar and find out which skills will get you to the top, and what you can do to develop them. Save your spot today! Tuesday, July 16th at 3 pm PST Jul 16 08:00 PM EDT  09:00 PM EDT Strategies and techniques for approaching featured GMAT topics. Tuesday, July 16th at 8 pm EDT Jul 19 08:00 AM PDT  09:00 AM PDT The Competition Continues  Game of Timers is a teambased competition based on solving GMAT questions to win epic prizes! Starting July 1st, compete to win prep materials while studying for GMAT! Registration is Open! Ends July 26th Jul 20 07:00 AM PDT  09:00 AM PDT Attend this webinar and master GMAT SC in 10 days by learning how meaning and logic can help you tackle 700+ level SC questions with ease. Jul 21 07:00 AM PDT  09:00 AM PDT Attend this webinar to learn a structured approach to solve 700+ Number Properties question in less than 2 minutes
Author 
Message 
TAGS:

Hide Tags

Director
Joined: 06 Jun 2004
Posts: 932
Location: CA

At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
17 Dec 2005, 23:41
Question Stats:
71% (01:36) correct 29% (01:37) wrong based on 595 sessions
HideShow timer Statistics
At a twoday seminar, 90 percent of those registered attended the seminar on the first day. What percent of those registered did not attend the seminar on either day? (1) A total of 1,000 people registered for the twoday seminar. (2) Of those registered, 80 percent attended the seminar on the second day.
Official Answer and Stats are available only to registered users. Register/ Login.




Director
Joined: 26 Oct 2016
Posts: 626
Location: United States
Concentration: Marketing, International Business
GPA: 4
WE: Education (Education)

Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
31 Jan 2017, 18:20
The information from the original problem plus statement (1) give you the first circle (900). Insufficient to solve for Neither. The information from the original problem plus statement (2) give you the second circle (800). Also Insufficient to solve for Neither. Together, you still have no idea how many individuals addended Both days. Since the proper formula for such a situation is Total = Group 1 + Group 2  Both + Neither, in our case we have 1000 = 900 + 800  Both + Neither. Since we are still left with two variables (B and N), the correct answer is E.
_________________
Thanks & Regards, Anaira Mitch




Manager
Joined: 12 Nov 2005
Posts: 75

Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
18 Dec 2005, 11:30
At a two day seminar, 90% of those registered attended the seminar on the first day. What percent of those registered did not attend the seminar on either day?
(1) A total of 1,000 people registered for the twoday seminar
(2) Of those registered, 80% attended the seminar on the 2nd day
Main Stem: 90% attended on First Day
Statement I:
1000 Registered....We dont know how many attended on Second Day And how many attended on both the days......Insufficient
Statement II:
80% on II day; We dont know how many attended on both the days to find the NONE.......Insufficient
Even after combining Statements I & II, we dont get the percentage attended on both the days to calculate the percentage who didnt attend at all....
Hence Answer is E



Manager
Joined: 09 Feb 2006
Posts: 115
Location: New York, NY

Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
13 Apr 2006, 16:30
The answer is E. We do not have enough information to solve this problem, because we don't know what percentage the overlap of attendance was between the two days. For example, all 80% that attended the second day also attended the first day. This would result in 10 % of people who didn't attend either day. however, if only 7/8 of the 80% that attended the second day also attended the first day, then you'd have 0% that attended either day. Since we could have multiple values that fulfill this, we cannot answer the question.
Statement 1 is irrelevant.



Manager
Joined: 08 Jul 2007
Posts: 159

Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
12 Jul 2007, 13:03
I am getting E on this one.
1) INSUFFICIENT: This tells us that 900 people attended the seminar on the first day. 100 people did not atttend. But we know nothing about day 2.
2) INSUFFICIENT: We don't have any numbers to calculate how many people actually went to the seminar on both days.
Together: We know that 100 people did not attend on day 1 and that 200 people did not attend on day 2. But these could be unique people, so that 0% did not attend the seminars on either day. It could also be that the 100 people who did not attend on day 1 did not attend on day 2. So together insufficient.
A venn diagram would only be useful if we knew something about the overlap, ie how many people who went to the seminar on day 1 that also went on day 2. Since we have nothing on that, I am thinking E.



Manager
Joined: 23 Sep 2016
Posts: 235

Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
20 Jun 2019, 01:43
TeHCM wrote: At a twoday seminar, 90 percent of those registered attended the seminar on the first day. What percent of those registered did not attend the seminar on either day?
(1) A total of 1,000 people registered for the twoday seminar.
(2) Of those registered, 80 percent attended the seminar on the second day. Can somebody help me to solve this question through matrix ? I was unable to form matrix. Please help me.



Manager
Joined: 04 Jun 2017
Posts: 100
Location: India
Concentration: Strategy, Operations
GPA: 3.82

Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
Show Tags
20 Jun 2019, 08:22
Total = Group 1 + Group 2  Both + Neither, in our case we have 1000 = 900 + 800  Both + Neither. Since we are still left with two variables (B and N), the correct answer is E. _________________




Re: At a twoday seminar, 90 percent of those registered attended the semi
[#permalink]
20 Jun 2019, 08:22






