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All trainees in a certain aviator training program must take

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All trainees in a certain aviator training program must take [#permalink] New post 26 Jun 2007, 11:39
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All trainees in a certain aviator training program must take both a written test and a flight test. If 70 percent of the trainees passed the written test, and 80 percent of the trainees passed the flight test, what percent of the trainees passed both tests?

(1) 10 percent of the trainees did not pass either test.
(2) 20 percent of the trainees passed only the flight test.
Director
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 [#permalink] New post 26 Jun 2007, 17:50
Set Theory
Total = Set1 + Set2 + Neither - Both (Common)
1)
100 = 70 + 80 + 10 - Both
Both = 60

2)
80 percent of the trainees passed the flight test.
20 percent of the trainees passed only the flight test.
Both = 80 - 20 = 60

D.
  [#permalink] 26 Jun 2007, 17:50
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