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If it is 6:27 in the evening on a certain day, what time in

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If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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New post 11 Mar 2011, 09:53
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A
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Question Stats:

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If it is 6:27 in the evening on a certain day, what time in the morning was it exactly 2,880,717 minutes earlier?

A. 6:22
B. 6:24
C. 6:27
D. 6:30
E. 6:32
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Re: What time  [#permalink]

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New post 11 Mar 2011, 10:04
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Madelaine88 wrote:
If it is 6:27 in the evening on a certain day, what time in the morning was it exactly 2,880,717 minutes earlier?
A/ 6:22
B/ 6:24
C/ 6:27
D/ 6:30
E/ 6:32

Any shortcut?


6:27 minus 2,880,717 in any way must end with 0, the only answer choice which ends with 0 is D.

Answer: D.
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Re: What time  [#permalink]

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New post 11 Mar 2011, 10:07
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If it is 6:27 in the evening on a certain day, what time in the morning was it exactly 2,880,717 minutes earlier?
A/ 6:22
B/ 6:24
C/ 6:27
D/ 6:30
E/ 6:32

Every day has: 24*60 = 1440 minutes
Divide 2880717/1440 = Without any calculation I can see that 2880 is double of 1440.

and 717 < 1440

Thus when divided; Quotient will be 2000 and the remainder will be 717.

Now; it is 6:27PM. Let's see how many minutes elapsed so far since the start of the day

18 hour = 18*60 = 1080 minutes + 27 minutes = 1107 minutes

717 minutes prior to 1107 = 1107-717 = 390

What was 390th minute since the start of the day;
390/60 = 6(3/6)th hour = 6(1/2) hour = 6:30AM

Ans: "D"
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Re: What time  [#permalink]

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New post 11 Mar 2011, 10:10
Convert the 2,880,717 minutes to hours by dividing by 60.

=> 2,880,717 / 60 = 48,011 (hours) and remainder of 57 (minutes)

Since time is 6:27 and you subtract 57 minutes => 6:30. Thus, D is the correct solution.
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Re: What time  [#permalink]

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New post 12 Mar 2011, 03:08
Hi stanford2012

What is the meaning of :

Since time is 6:27 and you subtract 57 minutes => 6:30

Regards,
Subhash
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Re: What time  [#permalink]

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New post 12 Mar 2011, 11:20
@ subhashgosh

All the answer choices are in the following format: 6:XX where 6 represents the hour and XX represents the minutes.

As a result you only have to care about how many minutes you have to subtract from 6:27. Given that 2,880,717 / 60 = 48,011 (hours) and remainder of 57 (minutes) you should simply subtract 57 from 6:27, which yields 5:30. Since there are only hours left to subtract the minutes won't change anymore. Thus, D (6:30) is the correct solution.

Hope it"s clear.
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Re: If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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New post 07 Mar 2014, 03:54
Looked at the units place

7-7= 0

Answer = D = 6:30
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Re: If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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New post 07 Mar 2014, 21:12
Hard to think this is an "easy" question...took me about a good 4-5min to solve but....


take 2,880,717 and before you divide it by 60, take all the combination of numbers that are divisible by 6
the largest being 2,880 since (8+8+2=18) which is 6x3

Then i thought 717 which actually is divisible by 3 (239x3) was prime but said...if 60x24= 1440 then 1440/2=12hrs=720

720-717=3min

6:27 + 3mins = 6:30

Surprised I didn't choose B :shock:
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Re: If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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New post 07 Mar 2014, 21:34
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I really don't think this question was meant to be 'solved' in the traditional manner by breaking it up into minutes etc., though all the approaches above that have done that have been analytically correct. Each one of these approaches is valid, and would in fact have been needed if there had been more than one option ending with a 0. However, that is not the case here and we must try and look for a quicker method. The GMAT does not usually require test-takers to enter into laborious calculations, so we must look for some other way to solve this.

As pointed out by Bunuel and PareshGmat, one must look at the last digit. If it is 6:27 now, what time would it have been 7 minutes earlier? 6:20 (notice the 0 at the end). How about 27 minutes earlier? Again, a 0 at the end. 277? 222777? Again, no matter what, will end with a 0. Therefore, looking at the options, we can quickly conclude that this would end with a 0 and then choose D.
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Re: If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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New post 08 Mar 2014, 00:29
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Option D
2880000 min=2000 days.
The leftover 717 minutes=11 hrs 57 min
Ans 6:27-11hrs 57min=6:30 morning
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Re: If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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New post 14 May 2015, 03:26
Madelaine88 wrote:
If it is 6:27 in the evening on a certain day, what time in the morning was it exactly 2,880,717 minutes earlier?

A. 6:22
B. 6:24
C. 6:27
D. 6:30
E. 6:32



Apart from concept of 0,I did not understand why B is not answer.
:)
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Re: If it is 6:27 in the evening on a certain day, what time in  [#permalink]

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