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

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At a two day seminar, 90% of those registered attended the [#permalink] New post 13 Apr 2006, 15:15
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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?

(I) A total of 1,000 people registered for the two-day seminar

(II) Of those registered, 80% attended the seminar on the second day.
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 [#permalink] New post 13 Apr 2006, 15:30
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.
  [#permalink] 13 Apr 2006, 15:30
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At a two day seminar, 90% of those registered attended the

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