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Six bells commence tolling together and toll at intervals of 2, 4, 6,

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Current Student
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Status: GMAT Date: 10/08/15
Joined: 17 Jul 2014
Posts: 94

Kudos [?]: 42 [0], given: 62

Location: United States (MA)
Concentration: Human Resources, Strategy
GMAT 1: 640 Q48 V35
GPA: 3.5
WE: Human Resources (Consumer Products)
Six bells commence tolling together and toll at intervals of 2, 4, 6, [#permalink]

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New post 27 Apr 2015, 07:52
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Question Stats:

31% (00:52) correct 69% (01:41) wrong based on 84 sessions

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Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

a) 10
b) 12
c) 15
d) 16
e) 4
[Reveal] Spoiler: OA

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Re: Six bells commence tolling together and toll at intervals of 2, 4, 6, [#permalink]

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New post 27 Apr 2015, 10:58
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LCM of 2, 4, 6, 8 10 and 12 is 120.

So, after each 120 seconds, they would toll together.

Hence, in 30 minutes, they would toll 30*60 seconds / 120 seconds = 15 times

But then the question says they commence tolling together. So, they basically also toll at the "beginning" ("0" second).

So, total tolls together = 15+1 = 16

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Re: Six bells commence tolling together and toll at intervals of 2, 4, 6, [#permalink]

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New post 04 Sep 2017, 22:27
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Kudos [?]: 287 [0], given: 0

Re: Six bells commence tolling together and toll at intervals of 2, 4, 6,   [#permalink] 04 Sep 2017, 22:27
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