So we need to consider those times where the time gap b/w the door opening/closing is greater than 15 min.Īt this juncture, lets make use of the table provided.
The sequence is Door opens > Light bulb on for 15 min > If there is any entry/exit in the room within the 15 min,the timer resets On the face of it they shall appear challenging and difficult to approach but when you break them down, you shall notice that using the core underlying logic your skills helped you to transform the question into a 600 level easy question!īreakdown the question stem at each line and map the sequence of events mentioned in the question. These questions truly and unapologetically test your logic and reasoning while throwing at you lengthy wordy forms of a 700+ question. Most of them are from the key areas of Arithmetic like Numbers, Percentage, Percentage Application, Ratios, Rates while some of them are also from undefined zones without any defined topic areas. On GMAT, word problems find a huge test space.
This is a wonderful question to test your abilities of understanding key words in a Question stem and breaking down the stem to simplify the underlying operation! If the times listed above are the times at which the door opened from 8:00 to 10:00, approximately how many minutes during this two-hour period was the light off ? Thus, after someone enters or exits the room, the light remains on for only 15 minutes unless the door opens again and reset the timer for another 15 minutes. The light in a restroom operates with a 15-minute timer that is reset every time the door opens as a person goes in or out of the room. GMAT assassins aren't born, they're made, That would get me thinking that the columns order the 16 times (and with a little review, we see that that's the case). A quick scan of the table shows us that the earliest 4 times are all in the 1st column and the 4 latest times (the only ones after 9:00) are all in the 4th column. Since we're asked to find the times that the light is NOT on, we need to start with the earliest time and work linearly through the 2 hours. Finally, the prompt itself tells us that every time the door is opened, a 15-minute timer resets (and keeps on) the bathroom light. That's actually the second clue - there is an "order" to the times (as they're arranged in columns - so that's probably how we should view them) with just a little bit of looking around, you can see that all 4 of the times in the 1st column are 'earlier' than the first time in the 2nd column (and so on). When thinking in those terms, the logical way to consider that type of data would be chronological order (and we can see that that's how the 4 columns are written). First, if you're just looking at the table, its title is "Times at Which the Door Opened from 8:00 to 10:00" - so we know that we're dealing with a 2-hour timeframe (starting at 8:00 and ending at 10:00). There are a number of 'context' clues in the way this prompt is written and formatted. 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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