Trainees

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sairamGmat: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Thu Feb 25, 2010 7:04 am; Thanked: 2 times

by sairamGmat » Wed Jul 21, 2010 1:03 am

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.

OA is D . I thought it is B. Not sure why it is OA..

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Source: Beat The GMAT — Data Sufficiency | Wed Jul 21, 2010 1:03 am

kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pmFollowed by: 7 members; Thanked: 215 times

by kvcpk » Wed Jul 21, 2010 1:23 am

sairamGmat wrote: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.

OA is D . I thought it is B. Not sure why it is OA..

W=70
F=80

W and F = W+F- W or F
(1) 10 percent of the trainees did not pass either test.
W or F = 100-10 =90
90=70+80-W and F
W and F = 60
Therefore 60 percent passed both.

(2) 20 percent of the trainees passed only the flight test.
F=80
Only flight =20
Therefore both F and W is 60

pick D

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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Wed Jul 21, 2010 3:37 am

Explanation by Praveen is very fine..

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