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Five bells begin to toll together and toll respectively at i [#permalink]
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02 Dec 2009, 01:16
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36% (01:52) wrong based on 218 sessions
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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
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Re: Five bells begin to toll together and toll respectively at i [#permalink]
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02 Dec 2009, 01:26
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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 D7 all bells will toll together once every 504seconds

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Re: Five bells begin to toll together and toll respectively at i [#permalink]
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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: Five bells begin to toll together and toll respectively at i [#permalink]
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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

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Re: Five bells begin to toll together and toll respectively at i [#permalink]
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09 Aug 2014, 13:08
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Re: Five bells begin to toll together and toll respectively at i [#permalink]
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13 Aug 2014, 02:29
We require the LCM, however do not need the actual LCM Value LCM = 2 * 3 * 2 * 6 * 7 \(Tolls = \frac{3600}{2 * 3 * 2 * 6 * 7} = \frac{50}{7} \approx{7}\) Answer = D
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Re: Five bells begin to toll together and toll respectively at i [#permalink]
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Re: Five bells begin to toll together and toll respectively at i [#permalink]
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10 Sep 2016, 05:23
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