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The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, minimum how

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The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, minimum how

by Gmat_mission » Sat Aug 22, 2020 3:23 am

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The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, minimum how many subsequent flights need to depart from Phoenix on-time, for the airport's on-time departure rate to be higher than 90%?

A. 6
B. 7
C. 9
D. 10
E. 11

Answer: B

Source: GMAT Club Tests
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