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OpenStudy (anonymous):
david has two electronic beepers;one of them beeps every 4 second ,the other beeps every 9 seconds .if they are turned at exactly the same time for how many times during the next hour will both beepers beep at the same time?
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OpenStudy (anonymous):
36 sec
OpenStudy (anonymous):
After 36 seconds both shall beep at the same time.In one hour there are 3600 seconds, So they shall beep simultaneously 100 times.
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