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# At a two day seminar, 90% of those registered attended the

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VP
Joined: 06 Jun 2004
Posts: 1066
Location: CA
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At a two day seminar, 90% of those registered attended the [#permalink]  17 Dec 2005, 22:41
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5% (low)

Question Stats:

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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 two-day seminar
(2) Of those registered, 80% attended the seminar on the 2nd day
Manager
Joined: 12 Nov 2005
Posts: 78
Followers: 1

Kudos [?]: 2 [0], given: 0

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 two-day 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....

Intern
Joined: 16 Oct 2005
Posts: 27
Followers: 0

Kudos [?]: 0 [0], given: 0

Kishore wrote:
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 two-day 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....

Wouldn't the answer be C, if we knew that every participant registered had to attend the seminar on both the days?
Senior Manager
Joined: 09 Aug 2005
Posts: 286
Followers: 1

Kudos [?]: 1 [0], given: 0

nothing tells us about the intersection

it is possible that 80% of the people on the second day were from 90 % on the first day - answer in that case is 100

But it is also possible that the 10 % who did not attend on he first day attended on the second day

therefore the answer to the question can be 0
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5099
Location: Singapore
Followers: 15

Kudos [?]: 116 [0], given: 0

(1) 1000 people registered: only information we can get is 900 people attended on day 1. Not sufficient.

(2) We do not know how many attended. Not sufficient.

Using both, still not sufficient as we do not know if the 80% comprised of the remaining 10% that did not attend on day1.

Ans: E
Senior Manager
Joined: 14 Apr 2005
Posts: 422
Location: India, Chennai
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Kudos [?]: 3 [0], given: 0

Re: GMAT Prep - DS Seminar [#permalink]  20 Dec 2005, 02:36
TeHCM wrote:
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 two-day seminar
(2) Of those registered, 80% attended the seminar on the 2nd day

Stmt1 : Nothing is known about the second day. so insuff.
Stmt2: Number of people registered is unknown so insuff.
Combined: % of people who attended on both days is not given. So insuff.

Hence E.
Senior Manager
Joined: 11 Nov 2005
Posts: 336
Location: London
Followers: 1

Kudos [?]: 8 [0], given: 0

E.

not possible to determine unless we know the % of registered who attended the seminar both the days.
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# At a two day seminar, 90% of those registered attended the

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