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Deborah and Mike visit the university library at regular

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Deborah and Mike visit the university library at regular [#permalink]  12 May 2008, 23:33
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]  13 May 2008, 00:01
I get a Monday , that too after 7 iterations of cycling Deb & Mike.

Not sure where I am going wrong
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Re: M11-31 [#permalink]  13 May 2008, 00:03
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
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Re: M11-31 [#permalink]  13 May 2008, 05:23
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.
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Re: M11-31 [#permalink]  13 May 2008, 05:25
I too get Saturday..

3&4..since the next time the meet will be 12 days apart..
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Schools: CBS, Kellogg
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Re: M11-31 [#permalink]  13 May 2008, 20:16
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, 20:16
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