![]() Total time the light is OFF: 8 + 3 + 14 = 25 minutes > The light turns off for the third and final time (from 9:46 – 10:00): for 14 MINUTES This extends the light 15 more minutes to 9:46. During that time, the door opens 1 more time at 9:31. > Here, the light turns off for the second time (from 9:26 to 9:29): for 3 MINUTES.ģ) At 9:29, the door opens and the timer resets for 9:44. At 9:11 the door opens once again – and extends the light until 9:26 This extends the light 15 more minutes to 9:20. During that time, the door opens 2 more times – the last at 9:05. > Here, the light turns off for the first time (from 8:46 to 8:54): for 8 MINUTES.Ģ) At 8:54, the door opens and the timer resets for 9:09. This extends the light 15 more minutes to 8:46. This extends the light 15 minutes from that time, to 8:34.ĭuring that time, the door opens 2 more times – the last at 8:31. ![]() At this point, the timer has reset several times – and we know that the light will STAY ON until 8:25…ĭuring that next ‘window’ of time, the door opens 2 more times – the last of which is at 8:19. During those first 15 minutes, the door opens another 5 times – the last of which occurs at 8:10. The primary work needed to answer this question involves simply keeping track of the timer – which means that some basic Arithmetic and note-taking is all that’s required to answer it.ġ) Since the door first opens at 8:00, we know that the light will stay on until at least 8:15. ![]() We’re asked for the total number of minutes that the light is OFF during those 2 hours. We are then told that a light in a restroom automatically turns on for 15 MINUTES every time the door is opened (and if the light is ALREADY ON, then the timer is reset back to 15 minutes). This prompt starts us off with a table that includes all of the specific times in which a door is opened between 8:00 and 10:00.
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