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GMAT Logic http://www.800score.com/forum/viewtopic.php?f=3&t=1544 
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Author:  questioner [ Sun Dec 11, 2011 5:21 pm ] 
Post subject:  GMAT Logic 
If the time is currently 1:30 pm, what time will it be in exactly 647 hours? A. 12:30 am B. 1:30 am C. 12:30 pm D. 2:30 pm E. 10:30 pm (C) If we divide 647 by 24, not arriving at a decimal, but rather keeping the answer in terms of an integer and the remainder, this number will represent the number of days and hours later that 647 hours is: 647/24 = 26, remainder 23. Therefore, 647 hours from now is the same as 26 days and 23 hours from now. The time will be exactly 1 hour earlier in the day, so it will be 12:30 pm. The correct answer is choice (C).  It is currently 1:30 pm, which is the same time as 13:30 am. Add 23 hours and one gets 12:30am. Answer A. 
Author:  Gennadiy [ Sun Dec 11, 2011 5:27 pm ] 
Post subject:  Re: t.2, qt.20: logic, arithmetics 
Quote: It is currently 1:30 pm, which is the same time as 13:30 am. Add 23 hours and one gets 12:30am. Answer A. If you convert the question into 24hour clock system, it will be:If the time is currently 13:30, what time will it be in exactly 647 hours? A. 00:30 B. 1:30 C. 12:30 D. 14:30 E. 22:30 One hour before 13:30 is 12:30 (which is the same as 23 hours after 13:30). The correct answer is C. Note, the 24hour clock system does not have "am" and "pm" abbreviations. 
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