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M11-31

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Math Expert
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Joined: 02 Sep 2009
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M11-31  [#permalink]

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New post 16 Sep 2014, 00:45
1
3
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

67% (01:02) correct 33% (01:24) wrong based on 42 sessions

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Deborah and Mike visit the university library at regular intervals every 3 and 4 days respectively. If both of them were in the library on Monday, what day of the week will it be when they meet in the library again?

A. Wednesday
B. Thursday
C. Friday
D. Saturday
E. Sunday
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Re M11-31  [#permalink]

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New post 16 Sep 2014, 00:45
Official Solution:

Deborah and Mike visit the university library at regular intervals every 3 and 4 days respectively. If both of them were in the library on Monday, what day of the week will it be when they meet in the library again?

A. Wednesday
B. Thursday
C. Friday
D. Saturday
E. Sunday

Deborah and Mike will meet in the library in \(3*4 = 12\) days (the least common multiple of 3 and 4), on Saturday.

Answer: D
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GMAT Date: 10-30-2016
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Re: M11-31  [#permalink]

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New post 20 Jul 2016, 10:11
My answer D)

I took LCM of 3 & 4 => 12.
Counted it from Tuesday and the 12th day resulted in a Saturday.(my ans). :)
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Re M11-31  [#permalink]

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New post 24 Nov 2019, 01:42
I think this is a poor-quality question and the explanation isn't clear enough, please elaborate. when we say they meet every 12 days, should we not consider the day after 12th day?
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Re M11-31   [#permalink] 24 Nov 2019, 01:42
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M11-31

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