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Six Bells Commence Tolling Together and Toll at Intervals of 2, 4, 6,8, 10 and 12s Respectively. in 30 Min, How Many Times Do They Toll Together? - Mathematics

MCQ

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

Options

  • 4

  • 10

  • 15

  • 16

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Solution

16

Explanation:
LCM, of 2, 4, 6, 8, 10, 12, is 120.
So, the bells will toll together after every 120 s (2 min).
In 30 min, they will toll together `30/2` + 1 = 16 times

Concept: Number System (Entrance Exam)
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