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# All trainees in a certain aviator training program must take

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Director
Joined: 09 Aug 2006
Posts: 529
Followers: 2

Kudos [?]: 23 [0], given: 0

All trainees in a certain aviator training program must take [#permalink]  26 Jun 2007, 10:39
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Question Stats:

0% (00:00) correct 100% (00:02) wrong based on 1 sessions
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
Joined: 06 Sep 2006
Posts: 746
Followers: 1

Kudos [?]: 15 [0], given: 0

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.
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