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Status: GMAT Date: 10/08/15
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Six bells commence tolling together and toll at intervals of 2, 4, 6,
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27 Apr 2015, 08:52
Question Stats:
37% (01:02) correct 63% (01:40) wrong based on 99 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
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Re: Six bells commence tolling together and toll at intervals of 2, 4, 6,
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27 Apr 2015, 11:58
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,
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04 Sep 2017, 23:27
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Re: Six bells commence tolling together and toll at intervals of 2, 4, 6, &nbs
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04 Sep 2017, 23:27






