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Manager
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Joined: 22 Jul 2008
Posts: 100
Location: Bangalore,Karnataka
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Kudos [?]: 25 [0], given: 11

Bells [#permalink] New post 02 Dec 2009, 01:16
00:00

Question Stats:

77% (01:19) correct 22% (02:45) wrong based on 9 sessions
Five bells begin to toll together and toll respectively at intervals of 6,7,8,9 and 12 seconds.How many times they will toll together in one hour?

A)5
B)14
C)6
D)7
E)9
Senior Manager
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Joined: 30 Aug 2009
Posts: 295
Location: India
Concentration: General Management
Followers: 2

Kudos [?]: 65 [0], given: 5

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Re: Bells [#permalink] New post 02 Dec 2009, 01:26
kirankp wrote:
Five bells begin to toll together and toll respectively at intervals of 6,7,8,9 and 12 seconds.How many times they will toll together in one hour?

A)5
B)14
C)6
D)7
E)9


D-7
all bells will toll together once every 504seconds
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Joined: 22 Jul 2008
Posts: 100
Location: Bangalore,Karnataka
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Kudos [?]: 25 [0], given: 11

Re: Bells [#permalink] New post 02 Dec 2009, 09:19
7 is right.

LCM of 6,7,8,9 and 12 = 504 so the bells will toll together after 504 sec i.e 3600/504 =7
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Re: Bells [#permalink] New post 02 Dec 2009, 13:47
Agree with 7 ... LCM = 2^33^27^1 = 504
1 hour = 60 mins * 60 secs = 3600 secs
3600/504 = 7 and change
Re: Bells   [#permalink] 02 Dec 2009, 13:47
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