Good paper test math problem.

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Good paper test math problem. [#permalink]

26 Jan 2008, 20:03

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Try and solve this in 2minutes.

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? (Assume standard time in one location.)
(A) 6:22
(B) 6:24
(C) 6:27
(D) 6:30
(E) 6:32

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Re: Good paper test math problem. [#permalink]

26 Jan 2008, 20:13

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D - 6:30

24 Hrs = 60*24 = 1,440 minutes

Question has 2,880,717 minutes = 2000 days + 717 minutes

720 minutes = 12 hrs...

So 6:27pm - 12 hrs = 6:27am

But we need 717 minutes = 6:30..

what is the oa ?
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Re: Good paper test math problem. [#permalink]

26 Jan 2008, 20:22

neelesh wrote:

OA is D. Very good.

I solved it somewhat similar. I just added 3 to 2,880,717 and saw that the result is divisible by 60. Thus if we were to add 3min to 6:27 then we get 6:30 (we can do this because we added 3min to both). Thus D.

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Re: Good paper test math problem. [#permalink]

26 Jan 2008, 23:29

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GMATBLACKBELT wrote:

D. it should end with 6:x0 because deducting x,xxx,xx7 from 6:27 must end with 0 in the unit digit of the minuet time.
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Re: Good paper test math problem. [#permalink]

26 Jan 2008, 23:33

Nice! Pretty cool what you did there GMAT TIGER.

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Re: Good paper test math problem. [#permalink]

27 Jan 2008, 03:09

GMAT TIGER wrote:

D. it should end with 6:x0 because deducting x,xxx,xx7 from 6:27 must end with 0 in the unit digit of the minuet time.

Simple and Cool!

+1
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Re: Good paper test math problem. [#permalink] 27 Jan 2008, 03:09

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Good paper test math problem.

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Good paper test math problem.

Good paper test math problem.

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