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M06 P.S problem

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Manager
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Joined: 02 Oct 2008
Posts: 58
Followers: 5

Kudos [?]: 11 [0], given: 0

M06 P.S problem [#permalink] New post 12 Dec 2009, 10:33
The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, how many subsequent flights need to depart from Phoenix on-time, for the airport's on-time departure rate to be higher than 90%?


6
7
9
10
11
In order to reach an above 90% on-time departure rate, the airport will need to have 10 out of 11 flights depart on time, so 7 more is the answer. If only 6 more depart on-time, it will be 90% exactly, and that's not enough.

The correct answer is B.


I am not sure why number 11 was chosen to solve the problem ? why other random numbers were no considered solve the above one? Please explain
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Re: M06 P.S problem [#permalink] New post 12 Dec 2009, 10:54
tania wrote:
The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, how many subsequent flights need to depart from Phoenix on-time, for the airport's on-time departure rate to be higher than 90%?


6
7
9
10
11
In order to reach an above 90% on-time departure rate, the airport will need to have 10 out of 11 flights depart on time, so 7 more is the answer. If only 6 more depart on-time, it will be 90% exactly, and that's not enough.

The correct answer is B.


I am not sure why number 11 was chosen to solve the problem ? why other random numbers were no considered solve the above one? Please explain


9/10 = 90%
but we want over 90%
10/11 > 90%
Re: M06 P.S problem   [#permalink] 12 Dec 2009, 10:54
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M06 P.S problem

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