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The first flight out of Pheonix on Sunday was late. If the

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Senior Manager
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The first flight out of Pheonix on Sunday was late. If the [#permalink] New post 08 Mar 2008, 02:42
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The first flight out of Pheonix on Sunday was late. If the following three flights departed on time, how many further flights need to depart on time in order for the airport's on time departure rate to be higher than 90%?

* 6
* 7
* 9
* 10
* 11
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Re: # of Flights ? [#permalink] New post 08 Mar 2008, 03:36
The first flight out of Pheonix on Sunday was late. If the following three flights departed on time, how many further flights need to depart on time in order for the airport's on time departure rate to be higher than 90%?

* 6->9/10 *100= 90
* 7->10/11 *100=90.9
* 9 ->12/13 *100=92.3
* 10->13/14 *100=
* 11->14/15*100 =

Flts that departed on time/total # of flts should be >90

Total # of flts -> 4+ flts per the option

Thus B
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Re: # of Flights ?   [#permalink] 08 Mar 2008, 03:36
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The first flight out of Pheonix on Sunday was late. If the

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