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# Bells

Author Message
TAGS:
Manager
Joined: 22 Jul 2008
Posts: 94
Location: Bangalore,Karnataka
Followers: 3

Kudos [?]: 33 [0], given: 11

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

Difficulty:

5% (low)

Question Stats:

72% (01:30) correct 27% (02:39) wrong based on 11 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
Joined: 30 Aug 2009
Posts: 293
Location: India
Concentration: General Management
Followers: 2

Kudos [?]: 78 [0], given: 5

Re: Bells [#permalink]  02 Dec 2009, 00:26
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
Manager
Joined: 22 Jul 2008
Posts: 94
Location: Bangalore,Karnataka
Followers: 3

Kudos [?]: 33 [0], given: 11

Re: Bells [#permalink]  02 Dec 2009, 08:19
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
Intern
Joined: 31 Oct 2009
Posts: 39
Followers: 1

Kudos [?]: 17 [0], given: 0

Re: Bells [#permalink]  02 Dec 2009, 12:47
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, 12:47
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