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# Deborah and Mike visit the university library at regular

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SVP
Joined: 04 May 2006
Posts: 1892
Schools: CBS, Kellogg
Deborah and Mike visit the university library at regular [#permalink]

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13 May 2008, 00:33
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Director
Joined: 05 Jan 2008
Posts: 688

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13 May 2008, 01:01
I get a Monday , that too after 7 iterations of cycling Deb & Mike.

Not sure where I am going wrong
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Persistence+Patience+Persistence+Patience=G...O...A...L

Manager
Joined: 23 Apr 2008
Posts: 86

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13 May 2008, 01:03
acc. to me the answer is saturday.
the l.c.m of 3 and 4 is 12.
after monday they will meet after every 12 days
VP
Joined: 10 Jun 2007
Posts: 1439

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13 May 2008, 06:23
sondenso wrote:
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

Saturday for me.
3 is prime, so they will meet again after 3*4 = 12 days.
That would be 12 days after monday.
7 days after is another monday.
5 days after that is Saturday.
Current Student
Joined: 28 Dec 2004
Posts: 3357
Location: New York City
Schools: Wharton'11 HBS'12

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13 May 2008, 06:25
I too get Saturday..

3&4..since the next time the meet will be 12 days apart..
SVP
Joined: 04 May 2006
Posts: 1892
Schools: CBS, Kellogg

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13 May 2008, 21:16
bkk145 wrote:
sondenso wrote:
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

Saturday for me.
3 is prime, so they will meet again after 3*4 = 12 days.
That would be 12 days after monday.
7 days after is another monday.
5 days after that is Saturday
.

Many thanks, your reasoning clears my confusal!
OA is D
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Re: M11-31   [#permalink] 13 May 2008, 21:16
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