<p>Maria has 2 electronic beepers. One of them beeps every 4 seconds; the other beeps every 9 seconds. If they are turned on at exactly the same time, how many times during the next hour will both beepers beep at the same time?</p>
<p>EDIT: Yeah, Duper’s correct.</p>
<p>They will beep together @ 36 seconds. Since 4 x 9 = 36 (Lowest common multiple)</p>
<p>Hour = 60minsx 60 seconds = 3600 seconds.</p>
<p>3600/36 = 100</p>
<p>Did this really quickly, so it might not be right.</p>
<p>I believe Duper is right. They would beep at the same time every 36 seconds. Don’t really know how to explain how I got this (used logic).</p>
<p>There are 3600 seconds in an hours, so divide that by 36. You get 100. Think that’s the answer.</p>
<p>Duper is correct.</p>
<p>The question is asking how many times will the beeper BOTH beep during the next hour. I found out how many seconds were in an hour e.g. 1 hour=60 minutes x 60 seconds = 3600 seconds. If the beepers will always beep together at 36 seconds so you can simply divide the total time by the intervals e.g. 3600/36 = 100 times.</p>
<p>This problem is Level 3/5.</p>