M06 P.S problem

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M06 P.S problem [#permalink]

12 Dec 2009, 11:33

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

Joined: 05 Mar 2008

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Re: M06 P.S problem [#permalink]

12 Dec 2009, 11:54

tania wrote:

9/10 = 90%
but we want over 90%
10/11 > 90%

Re: M06 P.S problem [#permalink] 12 Dec 2009, 11:54

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M06 P.S problem

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