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Mathematics 5 Online
OpenStudy (anonymous):

Adele accidentally hit the button on her clock radio that makes it go on and off repeatedly. The buzzer came on at exactly 7:00am. Then it went on and off at regular intervals. At 7:09am the buzzer was off, at 7:17 am it was on, and at 7:58 am it was on. Was the buzzer on or off at 9:00am?

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