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Bell X rings once every 12 minutes, bell Y once every 14 min
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07 Feb 2020, 04:44
07 Feb 2020, 04:44
00:00
Question Stats:
83% (02:30) correct
16% (00:45) wrong based on 6 sessions
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Bell X rings once every 12 minutes, bell Y once every 14 minutes, and bell Z once every 15 minutes. If, during a given day, the three bells ring at exactly the same instant, how many minutes will elapse before the three bells next ring simultaneously?
(A) 60
(B) 210
(C) 420
(D) 840
(E) 2,520
(A) 60
(B) 210
(C) 420
(D) 840
(E) 2,520
Re: Bell X rings once every 12 minutes, bell Y once every 14 min
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08 Feb 2020, 03:07
08 Feb 2020, 03:07
2
To find the moment when the three bells will ring at the same instant we need to find the LCM of the three times given.
The bells will ring at the same instant after every \(LCM(12,14,15)\) minutes = \(420\) minutes.
OA, C
The bells will ring at the same instant after every \(LCM(12,14,15)\) minutes = \(420\) minutes.
OA, C
Asif123 wrote:
Bell X rings once every 12 minutes, bell Y once every 14 minutes, and bell Z once every 15 minutes. If, during a given day, the three bells ring at exactly the same instant, how many minutes will elapse before the three bells next ring simultaneously?
(A) 60
(B) 210
(C) 420
(D) 840
(E) 2,520
(A) 60
(B) 210
(C) 420
(D) 840
(E) 2,520
gmatclubot
Re: Bell X rings once every 12 minutes, bell Y once every 14 min [#permalink]
08 Feb 2020, 03:07
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